Question

The equation below shows the area of a trapezoid, A, with a height of 9 cm, and one base 35 cm. :

A = 9 over 2(b + 35)

Which of the following formulas correctly solves for the other base, b?

b = 2A over 9 + 35
b = 2 multiplied by A over 9 - 35
b = 2 multiplied by A plus 35, all over 9
b = 2 multiplied by A minus 35, all over 9

Answer 1

@zzr0ck3r

Answer 2

can you help

Answer 3

@wio

Answer 4

\(A=\dfrac{9}{2(b+35)}\) ?

Answer 5

A=9/2 (b+35)

Answer 6

\[A=\dfrac{9}{2}(b+35)\]?

Answer 7

Yes

Answer 8

multipply both sides by \(\dfrac{2}{9}\) and what do you have?

Answer 9

multiply*

Answer 10

9/2b+ 315/1

Answer 11

2/9b

Answer 12

\((\dfrac{2}{9})A=(\dfrac{\cancel{2}}{\cancel{9}})\dfrac{\cancel{9}}{\cancel{2}}(b+35)\\\dfrac{2}{9}A=b+35\)

Answer 13

you with me?

Answer 14

Yes

Answer 15

subtract 35 from both sides

Answer 16

@skullpatrol

Answer 17

@wio

Answer 18

@UsukiDoll

Answer 19

@freckles

Answer 20

Hello

Answer 21

so leaving off with what zzrocker said we are solving for b and the last step he did was

\[(\dfrac{2}{9})A=(\dfrac{\cancel{2}}{\cancel{9}})\dfrac{\cancel{9}}{\cancel{2}}(b+35)\\\dfrac{2}{9}A=b+35 \]

Answer 22

there's not that much left to do with this problem... if we want b by itself, what do we have to do?

Answer 23

-35

Answer 24

from each side

Answer 25

yes

Answer 26

\[\frac{2}{9}A - 35 = b\]
that's it :)

Answer 27

you're looking for this selection right?
b = 2 multiplied by A over 9 - 35

Answer 28

thanks @UsukiDoll

Answer 29

can I get a medal? :)

Answer 30

i just did

Answer 31

thank you :)