Answer:
The pebble will hit the ground 8.29 second after it is thrown.
Step-by-step explanation:
Given that,
The height of the pebble after t seconds is given by the equation
h= -16t²+24 t+900.
When the pebble hit the ground, the height of the pebble will be zero.
So putting h=0 in the given equation.
0 = -16t²+24 t+900
⇒-4(4t²-6t-225)=0
⇒4t²-6t-225=0
Applying quadratic formula 
, here a=4, b= -6 and c= -225.
⇒ t = 8.29, -6.79
Since time can not negative.
∴t=8.29 seconds.
The pebble will hit the ground 8.29 second after it is thrown.
Answer:
Slope = 3
Step-by-step explanation:
Slope = 
Slope = 
Slope = 
Slope = 3
Answer: Slope = 3
Answer:343cm^3
Step-by-step explanation: looking at the question given by finding the
Volume of a cube=l^3
The Length =7cm
Then we are going to have;
V=7cmx7cmx7cm
Therefore, our answer will now be
V=343cm^3
Y - y1 = m(x - x1).....this is point slope form
slope(m) = -1
(2,4)...x1 = 2 and y1 = 4
now we sub
y - 4 = -1(x - 2) <===
Answer:
The length is approximately 8 feet.
Step-by-step explanation:
Since the side across from the 30 degree angle is HALF the side across from the 90 degree one, then we can write this equation (supposing the height of the building is x):
x^2 + 7^2= (2x)^2
x^2 + 49 = 4x^2
x= 4
since the length is 2x, it equals 4*2 = 8
