Step-by-step explanation:
Use the quadratic formula to find the solutions.
−b±√b2−4(ac)2a-b±b2-4(ac)2a
Substitute the values a=9a=9, b=0b=0, and c=−81c=-81 into the quadratic formula and solve for xx.
x=±3x=±3
The final answer is the combination of both solutions.
x=3,−3x=3,-3
Answer:
10 meters
Step-by-step explanation:
The given function 
represents the height, 
, in meters, 
seconds after the ball is thrown.
Since the ball is thrown off the roof, then ball's height will be equal to the roof's height before being thrown (0 seconds). Therefore, substitute 
into the given function :
Therefore, the building is 10 meters tall.
Answer:
6 people can go to the amusement park
Step-by-step explanation:
$207.50-$5= $202.50
$202.50-$33.75= 6
Answer:
There are no enough information to determine the length of the fence, assuming we were given the perimeter of the fence, and say, the dimension of the fence, then we can easily find the length.
Perimeter of the fence, P = 2(L + B).. If the fence is a rectangular.
L = (P/2) - B
If the fence is square, P = 4L
L = P/4
