maximum height. Round your answers to the nearest tenth.
Answer:
232.6 metres after 3.8 seconds.
Step-by-step explanation:
h(t) = -16t² + 122t
a = -16 b = 122 c = 0
Substitute into the quadratic formula
(Ignore the Â)
Split the equation at the ±
The two x-intercepts at 0 and 61/8. The midpoint of the x-intercepts is the axis of symmetry, which is the x-coordinate of the vertex.
Midpoint = [0 + (61/8)] / 2
Midpoint = 61/16 <= This is the time for maximum height
t = 61/16
t = 3.8125 => Round to t = 3.8
To find the maximum height, substitute t=61/16 into the equation
h(t) = -16t² + 122t
h(61/16) = -16(61/16)² + 122(61/16)
h(61/16) = 232.5625 => Round to h = 232.6
Therefore, the ball will reach the maximum height of 232.6 metres after 3.8 seconds.
B(3, 1)
C(1, –3)
D(–1, –3)
The solution to the given system of equations is (3, –1). The correct answer is option A.
The system of equations is given as:
x - 4y = 7 ....(1)
5x + 9y = 6 ....(2)
Solve the first equation for x:
x = 7 + 4y
Substitute the value of x in the second equation:
5(7 + 4y) + 9y = 6
35 + 20y + 9y = 6
29y = -29
y = -1
Substitute the value of y back into the first equation to find x:
x = 7 + 4(-1)
x = 7 - 4
x = 3
Therefore, the solution to the system of equations is x = 3 and y = -1.
Thus, the correct answer is option A.
Learn more about the equation here:
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The complete question is as follows:
Solve the below system of equations.
x – 4y = 7
5x + 9y = 6
A. (3, –1)
B. (3, 1)
C. (1, –3)
D. (–1, –3)