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
garri49 [273]
2 years ago
15

A small rock falling from the top of a 124-ft-tall building with an initial downward velocity of -30ft/sec is modeled by the equ

ation h(t)= -16t2-30t+124, where t is the time in seconds. For which interval of time does the rock remain in the air?
Mathematics
2 answers:
Mandarinka [93]2 years ago
5 0
You need to solve this for h(t)=0

<span>-16t^2-30t+124=0

This has two solutions, one is negative that does not make sense as time cannot be negative. 
The positive solution is t=2

So the interval where it is in the air is [0;2) 

</span>
Oduvanchick [21]2 years ago
4 0

Answer:

0\leq t

Step-by-step explanation:

A small rock falling from the top of a 124-ft-tall building with an initial downward velocity of -30 ft/sec is modeled by the equation .

Equation : h(t)= -16t^2-30t+124

Now we are supposed to find For which interval of time does the rock remain in the air

Substitute h(t)=0

-16t^2-30t+124=0

-2(8t^2+15t-62)=0

(t-2)(8t+31)=0

t = 2, \frac{-31}{8}

Since time cannot be negative .So, neglect \frac{-31}{8}

So, time interval for which  the rock remain in the air:

0\leq t

You might be interested in
Please I need help ASAP, please tell me how you know
mixas84 [53]

Answer: D it the For the way they have as examples

what do you need help on. what the problem

7 0
2 years ago
Plz help ASAP with Question 14
Yuliya22 [10]

Answer:

5000 cubic ft is the correct answer

8 0
2 years ago
NEED HELP PLEASE THANK YOU​
KiRa [710]

Answer:

D C

Step-by-step explanation:

first one because you do 5 to left and makes it 5 because its 1 per mile

seound one because go up 7 its at the school.

and sorry i cant see the other ones.

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Why can you multiply the numerator and the denominator of a fraction by the same number to find a equivalent fraction?
OLga [1]
Yes cause x*a/b*a=x/b
7 0
2 years ago
Read 2 more answers
What is an equation of the line that passes through the points
zubka84 [21]

Answer <u>(assuming it can be in slope-intercept form): </u>

y = x - 5

Step-by-step explanation:

1) First, find the slope of the equation. Use the slope formula, m = \frac{y_2-y_1}{x_2-x_1}, and substitute the x and y values of the given points into it. Then, solve:

m = \frac{(2)-(1)}{(7)-(6)} \\m = \frac{2-1}{7-6} \\m = \frac{1}{1} \\m = 1

2) Now that we know the slope and at least one point the line crosses through, we can write an equation of the line in point-slope form, or y-y_1 = m (x-x_1). Substitute m, x_1, and y_1 for real values.

Since m represents the slope, substitute 1 for it. Since x_1 and y_1 represent the x and y values of a point the line intersects, use any one of the given points (either one is fine, either way the equation will represent the same line) and substitute its x and y values into the equation. (I chose the point (6, 1), as seen below.) Finally, isolate y to put the equation in slope-intercept form.

y-1 = 1(x-6)\\y -1 = x-6\\y = x -5

6 0
2 years ago
Other questions:
  • I am literally sok confused about these... please help
    11·1 answer
  • 6/10 = 1/2 true or false
    7·1 answer
  • Write the set of real numbers in interval notation. {x | x ≥ −8}
    13·1 answer
  • Will Mark as brainliest if correct
    9·1 answer
  • Question seven plz help 20 points
    13·2 answers
  • John joined a fitness club that has a membership fee of $30 +25 per month. Mary’s club has a fee of 50 and charges 15 per month.
    15·1 answer
  • Can u guys help me plzzzzzzzzzzzzzz
    15·2 answers
  • Solve the equation for m:<br><br> m/5 = 60
    10·2 answers
  • Which represents the inverse of the function f(x) =4x?
    6·2 answers
  • 8 (2/3) divided by (-104/33)
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!