The percentage of information that is remembered by a particular person after one year (52 weeks) is 20%
The function f(x)=80e-0.5x+20 describes the percentage of information that a particular person remembers after x weeks.
To find the percentage of information that is remembered by a particular person after one year (52 weeks), we need to substitute x=52 in the given f(x).
f(x)=80[tex]e^{-0.5x}[/tex]+20
x=52, f(52)= 80[tex]e^{(-o.5\times 52)}[/tex]+20
=80[tex]e^{-26}[/tex]+20
=80(5.109 [tex]E^{-12[/tex])+20
= 4.087[tex]E^{-20}[/tex]+20
f(52)= 20
The percentage of information that is remembered by a particular person after one year (52 weeks) is 20%
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1. Mr. C has a square soccer field. The length of the soccer field is 18 feet.
What is the area of the soccer field:,
What is the perimeter of the soccer field
Answer:
Area = 324ft²
Perimeter = 72ft
Step-by-step explanation:
Area of a square = length²
Area of a square = (18ft)² = 324ft²
Perimeter of a square = 4*length
Perimeter of a square = 4ft*18 = 72ft
A company has found that the demand for its product varies inversely as the price of the product. When the price x is 4.75 dollars, the
demand y is 500 units.
Find a mathematical model that gives the demand y in terms of the price x in dollars.
With the help of algebra mathematical model equation for demand of company's product is given by the equation d = 1800 / p.
What is algebra?
The area of mathematics known as algebra deals with the representation of problems as mathematical expressions. For a mathematical expression to have meaning, it needs to include variables like x, y, and z as well as mathematical operations like addition, subtraction, multiplication, and division.
Let demand for company's product d vary inversely with its price p, which means
d ∝ ( 1/p ) or d = k * ( 1/ p) = k / p ----- 1
As when p = 4.5, d = 400
Putting these in (1), we get 400 = k/ 4.5
Hence #k=400 x 4.5=1800 and our model equation is
d = 1800/p
Hence mathematical model equation for demand of company's product is given by the equation d = 1800 / p.
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(×+13)²=(×+12)²+(×-5)²
Give it to me please :(
To solve the problem, we will use the law of signs, to solve the problem
Law of signs:- × - = +- × + = -+ × - = -+ × + = +With the law of signs, we solve, but first we must know the following.
¿What are the equations?We know that the equations are those mathematical expressions that are called in members and separated, by their equal sign, which these carry their known data and unknown or unknown data, these are related through their mathematical operations.
Solving problem: x² + 26x + 169 = x² + 24x + 144 + x² - 10x + 25x² + 26x + 169 = 2x² + 14x + 169x² + 26x - 2x² - 14x = 0-x² + 12x = 012x - x² = 0x (12 - x) = 0x = 0.12So, the result of this equation is x = 0.12
¡Hope this helped!
Answer:
x = 0, x = 12
Step-by-step explanation:
Given equation:
[tex](x+13)^2=(x+12)^2+(x-5)^2[/tex]
Expand:
[tex]\implies (x+13)(x+13)=(x+12)(x+12)+(x-5)(x-5)[/tex]
[tex]\implies x^2+26x+169=x^2+24x+144+x^2-10x+25[/tex]
Collect and combine like terms on the right side of the equation:
[tex]\implies x^2+26x+169=x^2+x^2+24x-10x+144+25[/tex]
[tex]\implies x^2+26x+169=2x^2+14x+169[/tex]
Subtract 169 from both sides:
[tex]\implies x^2+26x=2x^2+14x[/tex]
Subtract x² from both sides:
[tex]\implies 26x=x^2+14x[/tex]
Subtract 26x from both sides:
[tex]\implies 0=x^2-12x[/tex]
[tex]\implies x^2-12x=0[/tex]
Factor out the common term x:
[tex]\implies x(x-12)=0[/tex]
Apply the zero-product property:
[tex]\implies x=0[/tex]
[tex]\implies x-12=0 \implies x=12[/tex]
Solution:
x = 0, x = 127. Sketch a model to represent the equation
2x + 2 = 12. Then, solve the equation.
x = 5 will be the correct answer and Model is provided in attachment don't look at the beauty of my figure.
The solution of the equation 2x + 2 = 12 is x = 5. And the model and the graph are given.
What is an equation?Two algebraic expressions having same value and symbol '=' in between are called as an equation.
Given:
Equation 2x + 2 = 12
The model for the equation is given in the attached image.
And the graph is also given in the attached image.
To solve for x:
2x + 2 = 12
Simplifying,
2x = 12 -2
2x = 10
Divide by 2,
2x / 2 = 10 / 2
x = 5.
Therefore, the solution of the equation is x = 5
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Fill in the blanks 30 = 27 __ ___x 9 = 54 81 / ___ = 9 2 = ___ / 5 8 x ___ = 32 72 / ___ = 8 7* __ = 49
Step-by-step explanation:
this is a college level question, and you need help with that ? elementary school students have to be able to answer this.
30 = 27 + 3
6 × 9 = 54
81 / 9 = 9
2 = 10 / 5
8 × 4 = 32
72 / 9 = 8
7 × 7 = 49
in a survey, 32 people were asked how much they spent on their child's last birthday gift. the results were roughly bell-shaped with a mean of $48 and standard deviation of $7. construct a confidence interval at a 80% confidence level. give your answers to one decimal place.
The required 80% confidence interval is (46.15, 49.85).
What is a confidence interval?In frequentist statistics, a confidence interval is a range of estimates for an unknown quantity.
The most common confidence level is 95%, but when calculating confidence intervals, other levels, such as 90% or 99%, are also occasionally employed.
So, we know that:
n = 32
χ' = 48
s = 8
Create an 80% confidence interval using the equation below:
[tex]\left(\bar{X} \pm t_{\frac{\alpha}{2}} \times \frac{s}{\sqrt{n}}\right)[/tex]
To determine the critical value t for n-1 degrees of freedom and 1 -cl level of significance, use the formula below:
[tex]t_{0.2, d f=31}=\pm 1.309[/tex]
Create the confidence interval now:
[tex]\begin{aligned}& \left(48 \pm 1.309 \times \frac{8}{\sqrt{32}}\right) \\& (48 \pm 1.85) \\& (46.15,49.85)\end{aligned}[/tex]
Therefore, the required 80% confidence interval is (46.15, 49.85).
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work out and simplify where possible 7/8 - 1/4
Answer:
5/8
Step-by-step explanation:
1/4=2/8
7/8-2/8=5/8
5/8 cannot be simplified
Answer:
5/8
Step-by-step explanation:
(7-2)/8
5/8
A shoe store uses a 60% markup for all of the shoes it sells. What would be the selling price of a pair of shoes that has a wholesale cost of $55?
Answer:The selling price of shoes after a markup of 60% of the price will be equal to $81.60
Step-by-step explanation:
i don't think this is right
Determine a series of transformation that would map Figure S onto Figure T.
Answer:
reflection then rotation
Step-by-step explanation:
-3x-4y=-1, 3x-y=-4 solve by elimination
y = 1, and x = -1
if you need to show your work:
if you combine the two equations together (eliminating x), it goes like this
-3x - 4y = -1
3x - y = -4
-5y = -5
y = 1
this means:
-3x - 4 = -1
-3x = 3
x= -1
and
3x - 1 = -4
3x = -3
x = -1
Find (f - g)(x), if f(x) = 2x2 + 2 and g(x) = 6x2 + 6.
To find (f - g)(x), you can subtract g(x) from f(x):
(f - g)(x) = f(x) - g(x)
= (2x2 + 2) - (6x2 + 6)
= -4x2 + (-4)
= -4(x2 - 1)
Therefore, the result of (f - g)(x) is -4(x2 - 1).
Please help please and thank you.
Answer: 23 / 40 or 23:40
Step-by-step explanation:
Width = 69
Length = 120
so ratio of width is to length = 69 : 120
simplest form is 23 : 40 or 23 / 40 (fraction)
A bag contains 3 gold marbles, 7 silver marbles, and
28 black marbles. Someone offers to play this game:
You randomly select one marble from the bag. If it
is gold, you win $3. If it is silver, you win $2. If it is
black, you lose $1.
What is your expected value if you play this game?
To calculate the expected value of playing this game, we need to multiply the value of each possible outcome by its probability of occurring and then add these values together. In this case, there are 3 gold marbles, 7 silver marbles, and 28 black marbles in the bag, for a total of 38 marbles. So, the probability of selecting a gold marble is 3/38, the probability of selecting a silver marble is 7/38, and the probability of selecting a black marble is 28/38. The value of winning $3 if a gold marble is selected is $3 * (3/38) = $0.21. The value of winning $2 if a silver marble is selected is $2 * (7/38) = $0.37. And the value of losing $1 if a black marble is selected is -$1 * (28/38) = -$0.74. Adding these values together, we get $0.21 + $0.37 - $0.74 = -$0.16. Therefore, the expected value of playing this game is approximately -$0.16.
If a₁ = 6 and an
an-1 + 3 then find the value of a4.
Answer:
a₄ = 15
Step-by-step explanation:
using the recursive relation [tex]a_{n}[/tex] = [tex]a_{n-1}[/tex] + 3 and a₁ = 6 , then
a₂ = a₁ + 3 = 6 + 3 = 9
a₃ = a₂ + 13= 9 + 3 = 12
a₄ = a₃ + 3 = 12 + 3 = 15
I’ll give BRAINLIEST if correct need asap question is in the photo attached
Graph the line using the slope and y-intercept, or two points.
Slope:
1
y-intercept: (0,3)
x y
0 3
1 4
How much would you need to deposit in an account now in order to have $3,000.00 in the account in 1607 days?
Assume the account earns 3% simple interest.
You would need to deposit_____ in your account now.
Answer:
$ 2649.98
Step-by-step explanation:
1607 days = 1607/365 yrs
3000 = (deposit) + deposit * i * 1607/365 where i = decimal interest 3000 = deposit ( 1 + .03 * 1607/365)
3000/(1 + .03 * 1607/365) = deposit = $ 2649.98
URGENT!! ILL GIVE BRAINLIEST!!!! AND 100 POINTS!!!
Answer: a is a rational number
Step-by-step explanation
Rational numbers are written in p/q form.
(Multiplying Linear Expressions MC)
Simplify −5g(3g + 4).
A: −15g + 4
B: −15g − 20g
C: −15g2 + 4
D: −15g2 − 20g
The multiplication of the linear expression - 5g(3g + 4) is given by -15g² - 20g.
The correct answer option is option D
How to multiply linear expression?Multiplication: This is the process of computing the sum of a number with itself a specified number of times, or any other analogous binary operation that combines other mathematical objects.
- 5g(3g + 4)
open parenthesis
= -5g × 3g - 5g × 4
= -15g² - 20g
In conclusion, the linear expression - 5g(3g + 4) when simplified equals -15g² - 20g
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work out and simplify where possible 9/10 - 7/10
Answer:
1/5
Step-by-step explanation:
(9-7)/10
2/10
(2:2) / (10:2)
1/5
Emily loves to go the spa she and her friends go twice a month each visit she gets a 90 minute massage for $125 and a deluxe manicure and pedicure for $65. How much does she spent at the spa each month?
Answer: $380
Step-by-step explanation:
First, we will find the price per visit using addition.
$125 + $65 = $190
Next, we notice it says "twice a month" in the question. We will multiply the value above by two to find the price per month.
$190 * 2 = $380
Answer:
twice a month of 125 + 65
2($125 + $65)
= 2($190)
= $380
Step-by-step explanation:
heart and star pls <3 brainliest will be appreciated <3(っ◔◡◔)っ -{ elyna s }-Select all of the following equation(s) that are quadratic in form.
x4 – 6x2 – 27 = 0
3x4 = 2x
2(x + 5)4 + 2x2 + 5 = 0
6(2x + 4)2 = (2x + 4) + 2
6x4 = -x2 + 5
8x4 + 2x2 – 4x = 0
Answer:
Step-by-step explanation:
x4 – 6x2 – 27 = 0
x=2.49,-2.49
3x4 = 2x
x=6
11/3 of x is 55 find x
Answer:
16.5
Step-by-step explanation:
11/3 =3 and 1/3 so 55/3 and 1/3 = 16.5 or 16 and 1/2
what is the measure of X
The measure of an angle X is 11° and 3X+2°=35° , 4X-9° =35° .
What is meant by an angle?In Euclidean geometry, an angle is a figure made up of two rays that have a shared vertex, also known as a common terminus, and are referred to as the angle's sides. The angles of two rays are situated in the plane containing the rays. An angle is also created when two planes intersect at an angle. These are referred to as dihedral angles. Another technique to define two curves is to specify the angle generated by rays that are tangent to the intersection of two curves. Angle is another word for how long a rotation or angle is.
∠QPA = ∠UPA
3X+2 =4X- 9
4X-3X= 9 + 2
X= 11
The measure of X is 11
3X+2°=3(11)+2°
=35°
(4X-9)°=(4(11)-9)°
=35°
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what is the translation rule
Answer:
A translation is a type of transformation that moves each point in a figure the same distance in the same direction
Step-by-step explanation:
Translations are often referred to as slides. You can describe a translation using words like "moved up 3 and over 5 to the left" or with notation.
which of the following is false about probability distributions? O point the probabilities must total O. each probability should be greater than or equal to O. each probability should be positive, less than or equal to O. the outcomes listed must be independent.
The outcomes listed must be independent is false about probability distributions.
In probability theory, statistics, and the theory of stochastic processes, independence is a key concept. Informally speaking, two occurrences are independent, statistically independent, or stochastically independent if their occurrence has no bearing on either their chances or probability of occurring. Similarly to this, two random variables are independent if the probability distribution of either one is unaffected by the realization of the other.
It is important to distinguish between two definitions of independence when working with collections of more than two occurrences. Informally, mutual independence of events refers to each event being independent of any combination of other events in the collection, whereas pairwise independence of events refers to any two events in the collection being independent of each other.
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Let a,b,c,d be real numbers such that 1/a+Ï + 1/b+Ï + 1/c+Ï = 2/Ï
where Ï is non real cube root of unity choose the correct answer. abc+bcd+acd+abd is equal to
First, we can rewrite the given equation as:
1/a+Ï + 1/b+Ï + 1/c+Ï = (1/Ï)(1/a + 1/b + 1/c)where Ï is the non real cube root of unity.
We can then multiply both sides of the equation by Ï to get:
1/a + 1/b + 1/c = 2(1/a + 1/b + 1/c)This simplifies to:
1/a + 1/b + 1/c = 0Since a, b, and c are all real numbers, we know that 1/a, 1/b, and 1/c are also real numbers. Therefore, the sum of these three real numbers must also be a real number. The only way that 1/a + 1/b + 1/c can equal 0 is if all three of these terms are equal to 0.
Thus, we can conclude that a = b = c = 0.
Since a, b, and c are all equal to 0, we know that abc + bcd + acd + abd must also equal 0. Therefore, the answer is 0.
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The intensity of illumination at any point from a light source is proportional to the square of the reciprocal of the distance between the point and the light source. Two lights, one having an intensity ten times that of the other, are 7 m apart. On the line between the two light sources, how far from the stronger light is the total illumination least?
Answer:
The intensity of the light is inversely proportional to the square of the distance from the source of light. Therefore, in this situation, where one light source has an intensity ten times that of the other, the distance from the stronger light source would be 0.7m before the total illumination is the least.
Step-by-step explanation:
Two elephants are being delivered to the zoo. One elephant weighs 23,453 pounds, and the other elephant weighs 19,916 pounds. How many pounds do the elephants weigh together?
The required weight of the two elephants together is 43369 pounds.
How to add two similar quantity?Addition is an approach to consolidating things and considering them all together.Addition in math is a course of consolidating at least two numbers. Addends are the numbers added, and the outcome or the last response we get after the interaction is known as the total.
According to question:We have,
One elephant weighs 23,453 pounds, and the other elephant weighs 19,916 pounds.
To find total weight of two elephant together,we have to add them.
23,453 pounds + 19,916 pounds
43369 pounds
Thus, required weight of two elephant is 43369 pounds.
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graph the line y=3/2x
The equation of the line passes the origin. And the inclination of the line with the x-axis is 3/2. And the graph is given below.
What is a linear equation?An association between various factors brings about a straight model when a diagram is shown. The variable will have a level of one.
The straight condition is given as,
y = mx + c
Where m is the incline of the line and c is the y-block of the line.
The equation of the line is given below.
y = (3/2)x
The y-intercept is zero. Then the condition of the line passes the beginning. Furthermore, the tendency of the line with the x-pivot is 3/2.
The graph of the line is drawn below.
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100 POINTS!!!!
a) The next event requires each runner to jump 10 hurdles that are spaced 8.5 meters apart. If there are 13.72 meters from the starting line to the first hurdle and 10.5 meters from the last hurdle to the finish line, how long is the race? Show your work. (3 points)
PLEASE QUICK
Answer:
100.72
Step-by-step explanation:
[tex]Given,[/tex]
event requires each runner to jump 10 hurdles that are spaced 8.5 meters apart.
If there are 13.72 meters from the starting line to the first hurdle and 10.5 meters from the last hurdle to the finish line,
To Find: how long is the raceSolution:
runner to jump 10 hurdles that are spaced 8.5 meters apart.
Distance between 10 hurdles
=(10-1)* 8.5
=9*8.5
=76.5
If there are 13.72 meters from the starting line to the first hurdle and 10.5 meters from the last hurdle to the finish line,
Hence length of race = 13.72+76.5+10.5
=100.72
Mark me Brainliest pls
Answer:
100.72 meters
Step-by-step explanation:
To find the total length of the race, we need to sum:
The distance from the starting line to the first hurdle.The distances between the hurdles.The distance from the last hurdle to the finish line.The distance from the starting line to the first hurdle is 13.72 meters.
The distance between each of the 10 hurdles is 8.5 meters.
There are 9 spaces between hurdles 1 and 10, so the distance between the hurdles is 9 × 8.5 = 76.5 meters.
The distance from the last hurdle to the finish line is 10.5 meters.
To find the total length of the race, add these distances together:
[tex]\begin{aligned}\textsf{Total length of the race} &=\sf 13.72\; meters + 76.5\; meters + 10.5 \;meters\\\\&=\sf 100.72\; meters\end{aligned}[/tex]
Therefore, the race is 100.72 meters long.