Question

a rectangular window has a length of 72.1 cm and a width of 18cm. use the correct number of significant digits to write each indicated measure. help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1

Answer 1

sig fig for area?

Answer 2

what?

Answer 3

The length has 3 sig figs and the width 2, we know that so far

Answer 4

ok whats a sig figs

Answer 5

Is there an area or another measure you are given?

Answer 6

no

Answer 7

Significant Figures. These are the quantity of numerical measures by which calculations can show the least error in their evaluation.

Answer 8

it says find the perimeter and find the area

Answer 9

I'm not helping lol. Ok, so you need to know about significant figures a bit more. We find area by multiplying length x width, and perimeter by adding the widths and the lengths. With significant figures, adding and multiplying are done a bit different and is a little hard to explain.

Answer 10

Look at this to see how/what sig figs are.

http://www.usca.edu/chemistry/genchem/sigfig.htm

Answer 11

oh ok

Answer 12

so now what

Answer 13

Well, so when we multiply, we keep the same number of sig figs as the one with the least.

So 72.1 x 18 = 1297.8 but in 18 we only have 2 sig figs so our answer will have 2. Or 1300.

This would be our area.

Answer 14

Does that make sense?

Answer 15

yes

Answer 16

And with adding them, I don't really remember... I'm sorry I'm not much help today =(

Answer 17

its ok i dont get it either

Answer 18

I would say keep the same number as the least as well so when adding them together, just keep two at the end as well. Like 72.1 + 72.1 + 18 + 18 = 180.2 for perimeter. But make it 180.

Answer 19

Does that help?