1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
elena-14-01-66 [18.8K]
3 years ago
12

A ball is thrown from a height of 157 feet with an initial downward velocity of 9/fts . The ball's height h (in feet) after t se

conds is given by the following. =h−157−9t-16tsquared How long after the ball is thrown does it hit the ground? Round your answer(s) to the nearest hundredth. (If there is more than one answer, use the "or" button.)

Mathematics
1 answer:
antoniya [11.8K]3 years ago
8 0

Answer:

  2.86 seconds

Step-by-step explanation:

We presume the height is measured above the ground, so the height when the ball hits the ground is 0 feet. Putting that into the equation and solving for t, we get ...

  0 = 157 -9t -16t^2

We can use the quadratic formula with a=-16, b=-9, c=157 to find the solution.

  t = (-b -√(b^2 -4ac))/(2a) . . . . . we are not interested in the negative solution

  t = (-(-9) -√((-9)^2 -4(-16)(157)))/(2(-16))

  t = (9 -√10129)/-32 = (9 -100.6429)/-32 ≈ 2.86384

The ball will hit the ground about 2.86 seconds after it is thrown.

You might be interested in
Excellence Middle School charges $6.25 for students from all grade levels to attend the school dance. If S represents the number
vlabodo [156]
The answer would be b: 6.25(s+g)

you can already cancel out c., as there’s no way it could be 13.50

since it says it’s $6.25 dollars for all grades and you would be trying to find both 7th and 8th graders, you would need to multiply both variables by the amount they need to pay. in this case, $6.25.
6 0
2 years ago
The cost of a 12 ounce bag of cashews is $5.86. What is the cost per ounce of the cashews?
Afina-wow [57]
<h3>Answer: 5.86÷12=0.5 in nearest penny </h3><h3> </h3><h3>Step-by-step explanation: </h3><h3>this number kind of problem u solve it using inversely proportional method one one quantity is decreasing which is the ounce</h3>

3 0
3 years ago
Write an equation to make the number "24" using all the numbers 5,4,2,2 and +, -, x and ÷.
Snezhnost [94]

Answer: See explanation

Step-by-step explanation:

We are given the numbers 5,4,2, and 2 and told to make an equation from it and get a final answer as 24. This will be:

= 5 × 4 + 2 + 2

= 20 + 2 + 2

= 24.

Since we have gotten a final answer of 24, the equation is solved.

8 0
3 years ago
What is 64 mi/h =_____ft/s ?
victus00 [196]
31.288889,because hours have 60 min,1 min have 60 seconds so you will do 64/60=1.066666667/60=.0177777778
6 0
3 years ago
A train goes twice as fast downhill as it can go uphill, and 2/3 feet as fast uphill as it can go on level ground. If it goes 12
Yuri [45]

Answer:

0.5hrs

Step-by-step explanation:

Let the speed downhill be x,

Speed uphill is 0.5x. We are told than speed uphill is \frac{2}{3} the speed on flat ground. Therefore the speed on level ground will be \frac{0.5x}{2/3}=0.75x.

From this info, we can obtain the actual speed,v_g on level ground as:

x=120m/h\\0.75x=v_g\\\\\therefore v_g=\frac{0.75x \times 120m/h}{x}\\v_g=90m/h

speed, distance and time have the relation s=d/t so to obtain time to cover 45miles:

t=d/s\\=45/90\\=0.5h

Hence it takes 0.5hrs to cover 45miles on flat ground.

4 0
3 years ago
Other questions:
  • When you have two shapes to compare on a coordinate plane, you can determine the scale factor, knowing that the transformation w
    7·2 answers
  • A school custodian waxed a gymnasium floor that measured 20feet by 20 feet. How many square feet did she have to wax
    12·1 answer
  • Which of the following terminating decimals is equivalent to 3\8
    11·2 answers
  • What is the equation of a circle centered at (1,-4) and a diameter 18?
    9·2 answers
  • What is another way to write the absolute value inequality |p| less than or equal to 12
    14·2 answers
  • Find the slope of this please​
    15·1 answer
  • What are three consecutive even integers with the sum of -84?
    6·1 answer
  • What is the slope of the line that passes through the points ( 10 , − 6 ) (10,−6) and ( 8 , − 16 ) ? (8,−16)?
    15·1 answer
  • I need help!! Given: Quadrilateral pqrt , qsv , ptv , qv bisects rt , and Qr//pv
    15·1 answer
  • Please help me if you do I will give you brainliest!!! (if you have a crown) and I will give you a thank you AND 5 stars
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!