Elementary algebra help!!!?

h = 48 (2.5) - 16 (2.5)^2

h = 120 - 16(6.25)

h = 120 - 100

h = 20 ft

h = 48t - 16t^2

Since t = 2.5 sec, I guess you have just to plug it in the equation.

h = 48 (2.5) - 16 (2.5)^2

h = 120 - 16(6.25)

h = 120 - 100

h = 20 feet ===> the answer

just substitute 2.5 sec. to the given equation:

h=48*2.5+16*(2.5)^2

h= 120 +100

h=320 ft

h=48t - 16t^2

at t = 2.5 sec

height, h = 48(2.5) - 16(2.5)^2 = 20 ft

Just substitute 2.5 for t every time t occurs.

h is height.

h= 48t - 16t^2

h= 48(2.5) - 16(2.5)(2.5) now calculate it.

Just plug in 2.5 seconds for t (since t is time here) so

48(t) -16(t)^2=h

this is basically using the energy equation (assuming no non-conservative forces)

put 2.5 in for t

h=(48*2.5)-(16*(2.5*2.5))

h=120-100

h=20ft