Your brother is riding in a hot-air balloon over a lake. From an altitude of 4000 feet,
he throws a rock straight down toward the
water. When the rock leaves his hand, its
speed is 30 feet per second. How long will
it take the rock to hit the water?

(9x-5) - (x+12) what’s the answer and also explain how to do it i need it for a test tomorrow

Hillel is juggling flaming torches to raise money for charity. his initial appearance raises $500\$500 $500 , and he raises $15\$15 $15 for each minute of juggling performance. the amount rr r of money hillel raises is a function of tt t , the length of his performance in minutes. write the function's formula.

Hiroaki wants to find 3 3/4 - 7/8 explain why he must rename 3 3/4 to do the subtraction.