Answer: 2.5 seconds.
Step-by-step explanation:
Hi, since when the ball hits the ground the height = 0, to answer this question we have to substitute h=o in the equation:
h = - 4.9t2 - 35t +120
0 = - 4.9t2 - 35t +120
Applying the quadratic formula:
For: ax2+ bx + c
x =[ -b ± √b²-4ac] /2a
Replacing with the values given:
x =[ -(-35) ± √(-35)²-4(-4.9)120] /2(-4.9)
x = [ 35 ± √1,225 +2,352] /-9.8
x = [ 35 ± √3,577] /-9.8
x = [ 35 ±59.8 ] /-9.8
Positive:
x = [ 35 + 59.8] /-9.8 = 94.8 /-9.8 = -9.67 seconds
Negative:
x = [ 35 - 59.8] /-9.8 = -24.8 /-9.8 = 2.5 seconds
Since the time can't be negative, the answer is 2.5 seconds.
Feel free to ask for more if needed or if you did not understand something.
Answer:
I would need to see the problem.
Answer:
C. [-5] < [-3] || D. [-4] < [-2]
Step-by-step explanation:
in A. 5 should be greater, > than -3
in B. 2 should be greater, > than -4
in C. its correct answer. true statement.
in D. its correct answer. true statement.
Answer:
y = -7x + 57
Step-by-step explanation:
If the line is parallel, it will have the same slope. So, this line will also have a slope of -7.
Use y = mx + b, plug in the slope and given point, and solve for b:
y = mx + b
-6 = -7(9) + b
-6 = -63 + b
57 = b
Plug in the slope and y intercept into y = mx + b:
y = mx + b
y = -7x + 57
So, the equation is y = -7x + 57
Answer:
x > 4.5
Step-by-step explanation:
Given the inequality :
14.4x - 28.2 > 36.6
Collect like terms
14.4x > 36.6 + 28.2
14.4x > 64.8
Divide both sides by 14.4
x > 64.8 / 14.4
x > 4.5
