Please check answer and help with one of them:

Question

1. check please
car in an accident speed of car is the s, d is length of skid=30 feet
f is coefficient=0.5
use formula to find
s=sqaure root of 30*f*d
My answer is 21.21 because I took square root of 30(0.5)(30)
2. this one is baffling to me-how do I do this one-3 times square root of (x+1) is less than or equal to 7 Please help-Thank you

Answer 1

I posted earlier but no one answered so I was hoping if I reposted someone could help

Answer 2

3√(x+1) ≤ 7
9(x+1) ≤ 49
9x+9 ≤49
9x ≤ 40
x ≤ 40/9
of course in √(x+1) , x >-1 or else the √ is undefined.

so -1 ≤ x ≤ 40/9

Answer 3

Thank you for showing me the second one-just one question-is #1 correct the way I did it?
Thank you

Answer 4

correct if you formula was
s = √(30fd)

Answer 5

The 30fd was under the square root sign-thank you