Question

Can someone explain if I am wrong?

My answers for this so far are:
A. (b-10)(b+10)=180 and b is 2√70
B. (2√70-10)=c, so C is 6.733201
C. (2√70+10)=d, so D is 26.733201

Answer 1

Answer: A first one at the top
I hope this helps you with your stuff !

Answer 2

Explanation:

A. (b - 10)(b + 10) = 180

`b^(2)`-100 = 180

`b^(2)`= 280

b =
`√(280)`

b = 2
`√(70)`

Your A is correct.

B. 2
`√(70)` - 10 = c

c = 6.733200531 = 6.73 Try rounding to 3 significant figures.

C. 2
`√(70)` + 10 = d

d = 26.73320053 = 26.7

You are correct in all 3 answers. Perhaps you should try rounding to 3 significant figures for your c and d values.

I hope this helps!! ^-^