The height h (in feet) above the water of a cliff diver is modeled by h=-16t^2+8t+80 where t is the time (in seconds). how long is the diver in the air? plz ! 10 !

What expression is equivalent to 1/2(2+3x-6)

Acircle has a circumference of 28.36 units what is the diameter of the circle

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years