Answer:
C,D
Step-by-step explanation:
E d g e n u i t y
slant height(h) = 16.3ft
Base side = 20ft

Perimeter of base = 4(base side) = 4(20) = 80ft
It gives function: h = -16t^2 + 40
water is when height is 0 so solve for 0= -16t^2 + 40
subtract 40 from both sides: -40 = -16t^2
divide by -16: -40/-16 = t^2
simplify: 5/2 = t^2
square root both sides: 1.58 = t
the orange hits the river in 1.58 seconds.