Askateboarder leaves a 12-foot tall ramp with an initial vertical velocity of 8 feet per second. the function f(h) = -8t^2 + 8t + 12 represents the height, h, in feet of the skateboarder after t seconds. how many seconds was the skateboarder airborne?

As part of an annual fundraiser to raise money for diabetes research, diane joined a bikeathon. the track she biked on was 1,920 yards long. diane biked 38.5 laps. her sponsors agreed to donate an amount of money for each mile she biked. how many miles did she bike? first fill in the blanks on the left side using the ratios shown. then write your answer. given ratios: 5280ft / 1 mi , 1 mi /5280 ft , 1,920 yards / 1 lap , 1 lap / 1,920 yards , 3 ft / 1 yard , 1 yard / 3 ft. blanks: 38.5 laps / 1 yard x (blank) x (blank) x (blank) = (blank) miles i'm really confused on how to do this, and the explanations aren't exactly . if you could walk me through how to do this, it would be greatly appreciated.

What is the solution to the equation? k/6.4=8.7 2.3 5.568 15.1 55.68

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?