21. A roller coaster goes down the first grade eight times faster than it goes up the other side. The distance down is 100 ft more than the distance up, and it takes 70 sec to go up and 10 sec to come down. What is the speed in feet per second of the roller coaster when it goes up and when it comes down?

What is the equation of the following graph in vertex form? parabolic function going down from the left through the point zero comma twelve and through the point two comma zero and turning at the point four comma negative four and going up through the point six comma zero and continuing towards infinity courtesy of texas instruments a: y = (x − 4)2 − 4 b: y = (x + 4)2 − 4 c: y = (x + 2)2 + 6 d: y = (x + 2)2 + 12

Acar travels at an average speed of 52 miles per hour. how long does it take to travel 299 miles

I’m stuck on this equation, anyone got the answer?