When I round 6396 to 3 significant figures, I get 6400. I was double checking my work and used scientific notation for 6400, which is 6.4*10³, but when I counted the significant figures in scientific notation, I only get 2, which are 6 and 4, but there were supposed to be 3. Anyone can help to explain?

This is one slight annoyance when it comes to sig figs, in my opinion anyway. You did the steps correct. The 639 bumps up to 640, so 6396 rounds to 6400 when rounding to 3 sig figs.

Normally the trailing zeros, ie zeros on the right, are not significant. So 6400 shows only 2 sig figs. What we need to do is draw a horizontal line over the first zero to show that it is significant (while the other zero is not significant)

So you'll write it like this [tex]64\overline{0}0[/tex]

This notation can be problematic when it comes to decimals because it could be easily mixed up with the repeating decimal notation.

When you convert [tex]64\overline{0}0[/tex] to scientific notation, you would get [tex]6.40 \times 10^3[/tex].

In short: [tex]64\overline{0}0 = 6.40 \times 10^3[/tex]

Here the zero is significant because the zero is present in the scientific notation result. Writing [tex]6.4 \times 10^3[/tex] shows 2 sig figs while [tex]6.40 \times 10^3[/tex] has 3 sig figs.

It's similar to how the number [tex]5.7[/tex] has 2 sig figs while [tex]5.70[/tex] has 3 sig figs. While the zero is trailing, having it after a decimal point indicates to the reader that you achieved this level of accuracy.

Answer:

This is one slight annoyance when it comes to sig figs, in my opinion anyway. You did the steps correctly. The 639 bumps up to 640, so 6396 rounds to 6400 when rounding to 3 sig figs.

Normally the trailing zeros, ie zeros on the right, are not significant. So 6400 shows only 2 sig figs. What we need to do is draw a horizontal line over the first zero to show that it is significant (while the other zero is not significant)

So you'll write it like this  

This notation can be problematic when it comes to decimals because it could be easily mixed up with the repeating decimal notation.

When you convert  to scientific notation, you would get .

In short:  

Here the zero is significant because the zero is present in the scientific notation result. Writing  shows 2 sig figs while  has 3 sig figs.

It's similar to how the number  has 2 sig figs while  has 3 sig figs. While the zero is trailing, having it after a decimal point indicates to the reader that you achieved this level of accuracy.

A person on a moving sidewalk travels 36 feet in 6 seconds. The moving sidewalk has a length of 180 feet. How long will it take to move from one end to the other?
Help pls?

PLZ HELP!! Geometry! 10 points!

Need helpp fastt plss will give brainliest to who is correct plss helpp
PLSSS HELPP I NEED THE ANSWER CORRECT

Each order of nachos costs $3.75 at the concession stand and each drink costs $2.25. Which statement is true if Sarah bought three orders of nachos?

A
The product of 3(–2.25) means Sarah has $6.75 less when she bought 3 orders of nachos.

B
The product of 3(2.25) means Sarah has $6.75 more when she bought 3 orders of nachos.

C
The product of 3(–3.75) means Sarah has $11.25 less when she bought 3 orders of nachos.

D
The product of 3(3.75) means Sarah has $11.25 more when she bought 3 orders of nachos.

will give brainliest!!

Please help!

3(x-4)=5(x+2)

this is due soon pls help pls help with ALL the question

Help me plz i forgot to put this in the other question!

can someone help me with this

Find the unit rate Patricia paid $385 for 5 nights at a hotel. What is the cost for 1 night?

Which of the following is a correct interpretation of the expression 2 - (-5)
A The number that is 5 to the left of 2 on the number line
B The number that is 5 to the right of 2 on the number line
C The number that is 2 to the left of -5 on the number line
D The number that is 2 to the right of -5 on the number line

2. Li bought five lip balms. Each lip balm costs the same amount. She spent a total of $7.25.
(a) Write an equation that represents the situation. Use c to represent the cost of each lip balm.
(b) Represent the equation with a model.
(c) Solve and justify your solution.

Help plss

Mae ling earns a weekly salary of $325 plus a 6.5% commission on sales at a gift shop. How much would she make in a work week if she sold $4,800 worth of merchandise?

QUICKLY
Parallel lines r and s are cut by two transversals, parallel lines t and u. Which angles are alternate exterior angles with angle 11? Angle5 and Angle13 Angle7 and Angle15 Angle6 and Angle16 Angle8 and Angle14

Match the inequality to the correct verbal description. "n is less than the difference of 40 and 60.
A.n<40-60
B.n>40-60
C.-40>60
D.n-60<40​

Can you pls answer these questions?
I'm giving brainliest

What is the solution to the system of equations graphed below?

On a coordinate plane, a line goes through (negative 5, 1) and (0, 3) and another line goes through (negative 5, 1) and (negative 4, 0).

A. (–5, 1)
B. (1, –5)
C. (3, –4)
D. (–4, 3)

Kayla bought a book for $13 . She now has $47 . How much did Kayla have before she bought the book?

Find the quotient of 3/5 and 9/10. Express your answer in simplest form.

Sorry this is irrelevant but would you eat this

PLEASE HELP ME WITH THIS!! I WILL GIVE EXTRA POINTS,AND BRAINLIST IF YOU ANSWER THIS CORRECTY!!

Find two numbers that add up 158. The greater number is 40 more than the lesster number.

A. 70 and 110
B. 99 and 59
C. 80 and 78
D. 98 and 60
E. 100 and 68

What is the area of the object above?
A.
155 cm2
B.
60 cm2
C.
225 cm2
D.
120 in2

I’ll give brainliest PRONTO

Pls yall have to help me hurry to get 10 pionts but you have to have a explamation and a answer pls pls pls if you do something wrong ill report you hurry tho


Martin decided to buy 2 bags of grapes weighing 5 and two-thirds pounds each, instead of the 3 bags weighing 4 and one-fifth pounds each, because the bigger bags were on sale. Did he end up with more grapes or less grapes by buying the bigger bags?

1.He ended up with about One-half pound less grapes.
2.He ended up with about One-half pound more grapes.
3.He ended up with about 1 pound less grapes.
4.He ended up with about 1 pound more grapes.

Money in a particular savings account increases by about 6% after a year. How much money will be in the account after one year if the initial amount is $100?

how do I know if im diving with ratio's or multiplying? please put a equation problem about dividing and multiplying ratios

Please help me my Math Grade Is a D-

Why are we unable to see x-rays?

btw I know this is not math but I put it as math because if I put it as physics no one would see it ;-;

What is the initial value, and what does it represent?

A. The initial value is 100; it represents money left over from last year's fundraiser

B. The initial value is 100; it represents money earned per card


C. The initial value is 2; it represents money left over from last year's fundraiser


D. The initial value is 2; it represents money earned per card

Brad has walked 4/9 of his goal distance this month. If his goal is 27 miles, how many miles has Brad walked