X+4b=72. if x=12, what’s the value of b?

b= 15

step by step:
plug the 12 into the x position to make it 12+4b=72
subtract on both sides to get
4b=60
divide and b=15!

You need to divide 210 square inches by 35 inches and that’s going to give you 6 inches and that’s the length of the hypothenuse of the right triangle i hope that this you : )