Answer: your answers are correct. I inserted an image of the answers.
Step-by-step explanation:
step 1. x intercepts are where y = 0
step 2. y = 0 when factors are equal to zero
step 3. the x intercepts are 0, sqr(3), -sqrt(3), -1/5
step 4. answer: 4.
The answer is 66.6 repeated so if you round 66.6 repeated you get 67 so I think the answer is about 67 miles per hour
