Aurora S. thought she had found her true love while vacationing in Italy. To symbolize the "locking of their hearts Aurora and her soulmate
placed a lock on the Ponte Milvio Bridge and threw the key into the Tiber
River. The key left her hand 19.8 meters above the water and had an
initial velocity of 15m/sec. How long was the key in flight before it hit the
water? (round to the nearest hundredth)

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.

whats the question?

step-by-step explanation: