# Pre-Calc

posted by
**Ellie**
.

Please check answer and help with one of them:

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