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babunello [35]
3 years ago
15

What speed must you toss a ball straight up so that it takes 4 s to return to you? Show your work.

Mathematics
1 answer:
vekshin13 years ago
4 0
1) Type of  motion: constant acceleration.
 
2) acceleration, a = 9.8 m/s^2

3) time up = time down = 4seconds / 2 = 2 seconds

4) formula = Vf = Vo - a*t^2/2

Vf = 0 => Vo = a*t^2 / 2 = 9.8m/s^2 * (2 s)^2 / 2 = 19.6 m/s

Answer: 19.6 m/s
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Stolb23 [73]
The ratio of boys to girls is

5:6

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8 0
2 years ago
Identify whether each variable is categorical or continuous.
balandron [24]

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3 0
3 years ago
What are the solutions of the equation x4 – 5x2 – 36 = 0? use factoring to solve.
Paul [167]
X^4 - 5x^2 - 36 = 0
(x^2 - 9)(x^2 + 4) = 0  - factor the left side
(x + 3)(x - 3)(x^2 + 4) = 0 - factor (x^2 - 9 as difference of squares)
x + 3 = 0    x - 3 = 0    x^2 + 4 = 0  Set each factor to 0 if any 0 the left side 0
x = -3         x = 3         x^2 = -4
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The roots are 3, -3, 2i, -2i  (Don't know if you need the imaginary roots but I gave you them anyway)
8 0
3 years ago
Read 2 more answers
A repair bill for your car is $553. The parts cost $265. The labor cost is $48 per hour. Write and solve an equation to find the
Lilit [14]

Answer:

6 hours

Step-by-step explanation:

Let the labor hours be x.

The bill comprises of parts cost plus labor cost. Labor cost is hours times the cost per hour. Then we have equation:

  • 265 + 48x = 553
  • 48x = 553 - 265
  • 48x = 288
  • x = 288/48
  • x= 6

So the answer is 6 hours.

4 0
3 years ago
The hypotenuse of a right triangle is 14 in. If the base
antoniya [11.8K]

Answer:

13.85

Step-by-step explanation:

U use the pythagorean theorem

So 2^2 + x^2 = 14^2

Simplify the equation: 4+x^2=196

--> x^2=192

--> x=13.85

-Hope this helps :)

8 0
3 years ago
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