The height of a tennis ball tossed into the air is modeled by h(x) = 40x – 16x 2, where x is elapsed time in seconds. During what time interval will the tennis ball be at least 15 feet above the ground?

x > 0.5 seconds and x > 2.04 seconds
x > 0.5 seconds and x ≤ 2.04 seconds
x ≥ 0.5 seconds and x > 2.04 seconds
x ≥ 0.5 seconds and x ≤ 2.04 seconds

pretty sure its D

Step-by-step explanation:

it says at least 15, meaning that the value can also 15 and the only one with two equal values is D so logic

if x decreases by 4 then y increases by 10

step-by-step explanation:

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47