Atrebuchet launches a projectile from a hilltop 30 feet above ground level on a parabolic arc at a velocity of 40 feet per second. the equation h = ? 16t2 + 40t + 30 models the projectile's h height at t seconds. how long will it take for the projectile to hit its target on the ground? (to the nearest tenth of a second)

t = 3.1 seconds

Step-by-step explanation:

Set the equation h = -16t^2 + 40t + 30 equal to 0 (0 represents ground level).

Then h = -16t^2 + 40t + 30 = 0

Applying the quadratic formula with a = -16, b = 40 and c = 30,

      -40 ± √( 1600 - 4[-16][30] )

t =

                  2(-16)

      -40 ± √ 3520

t =

             -32

                                                                               -40 - 59.33

Only the positive t value makes sense.  It is t =

                                                                                      -32

t = 3.1 seconds

it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540

it would take 5 hours i think idk i'm not that good at math.can you me with my questions i need asap.