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B=10

B = 10

Step-by-step explanation:

First we are to find the scale factor

We can do this using the ratio of the sides

From small to large

4:10

Divide each term by 2

4/2 : 10/2

2:5

The scale factor is

2/5

We want to find side B

We can use ratios

4           B

=  

10          25

Using cross products

4*25 = 10*B

100 = 10B

Divide each side by 10

100/10  =10B/10

10=B

the answer is 844

step-by-step explanation:

it is 844 because if you add 836.50 + 7.5 you will get 844