15) An arrow is shot upward and outward from the top of a 83-foot cliff, with an initial velocity of 132 feet per second. The height of the arrow t seconds after
launch is given by the equation ℎ = −16
2 + 132 + 83.
a) At what time does the arrow reach its maximum altitude? Round to the
nearest second.
b) What is the maximum altitude?

nlgqer

step-by-step

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional