Aball is thrown from a height of 45 meters with an initial downward velocity of 10 m/s. the ball's height h (in meters) after t seconds is given by the following. h=45-10 t- 5 t^2. how long after the ball is thrown does it hit the ground?

2.16 s

Step-by-step explanation:

When it hits the ground, height h=0 hence

Using quadratic formula

Since time can't be negative,

t=2.16 s

x = 10.1

step-by-step explanation:

all of the angles of a tirangle add up to 180º

180 - 65 = 115 (since we already know the value of one angle)

(2x + 7) + (8x + 7) = 115

(combins like terms) 10x + 14 = 115

(isolate the variable subtract 14 from both sides): 10x = 101

(find the variable divide both sides by 10): x = 101/10

x = 10.1

the answer is b.

step-by-step explanation: