Answer:
a+9b+10
Step-by-step explanation:
use foil method
5=100%
5/100=0.05=1%
7.5/0.05=150%
Answer: +50%
4/10 is equal to 4 out of 10 or 40%
This means you should shade 4 of the 10 blocks
I believe is C and D because
C. The original rectangle width is 2m and the length is 4m. And to make the other rectangle they are adding .5 m to both the width and length
D. The original rectangle has a width of 2m and length of 4m. To make the other rectangle they are substracting 1 m from the width and length