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
sammy [17]
3 years ago
8

A person standing on a second floor balcony drops keys to a friend standing below the balcony. The keys are dropped from a heigh

t of 10 feet. The height in feet of the keys as they fall is given by the functionh(t)=−16t2+10, where t is the time in seconds since the keys were dropped.
The friend catches the keys at a height of 4 feet. Find the elapsed time before the keys are caught.
Mathematics
1 answer:
Lostsunrise [7]3 years ago
6 0

Answer:

sqrt(3/8) = t

.61237 = t

Step-by-step explanation:

h(t)=−16t^2+10

Let h(t) = 4

4 =−16t^2+10

Subtract 10 from each side

4-10 =−16t^2+10-10

-6 = -16 t^2

Divide by -16

-6/-16 = t^2

3/8 = t^2

Take the square root of each side

sqrt(3/8) = sqrt(t^2)

sqrt(3/8) = t

.61237 = t

We only take the positive since time is not negative

You might be interested in
Reposting this because no body gave me the equation. An equation would be appreciated :)
o-na [289]

bring the like terms together,

\frac{6q}{5}  +  \frac{4q}{5}  \leqslant 28 + 3 + 3 - 3

\frac{10q}{5}  \leqslant 31

2q \leqslant 31

q \leqslant  \frac{31}{2}

3 0
2 years ago
Read 2 more answers
If y varies inversely to x and y=9 when x=-6 find x when y=3
Minchanka [31]

Answer: y =21

Step-by-step explanati

8 0
2 years ago
Read 2 more answers
What is the value of C in the matrix equation below?
lara [203]

Given:

The matrix equation is:

\begin{bmatrix}-18&3&5\end{bmatrix}-C=\begin{bmatrix}-22&1&12\end{bmatrix}

To find:

The value of matrix C.

Solution:

Let A=\begin{bmatrix}-18&3&5\end{bmatrix},B=\begin{bmatrix}-22&1&12\end{bmatrix}. Then the given equation can be rewritten as

A-C=B

-C=B-A

C=-(B-A)

C=A-B

On substituting the values of the matrices, we get

C=\begin{bmatrix}-18&3&5\end{bmatrix}-\begin{bmatrix}-22&1&12\end{bmatrix}

C=\begin{bmatrix}-18-(-22)&3-1&5-12\end{bmatrix}

C=\begin{bmatrix}-18+22&2&-7\end{bmatrix}

C=\begin{bmatrix}-4&2&-7\end{bmatrix}

Therefore, the correct option is C.

6 0
2 years ago
Read 2 more answers
Please answer this question please ​
Bas_tet [7]
<h3>Answer:</h3><h3 /><h3>Amount = Rs 13891.50</h3><h3>Compound interest = Rs 1891.50</h3>

Step-by-step explanation:

C = Amount (A) - Principal (P)

Where

C is the compound interest

To find the amount we use the formula

A = P ({1 +  \frac{r}{100} })^{n}

where

P is the principal

r is the rate

n is the period / time

From the question

P = Rs 12, 000

r = 5%

n = 3 years

Substitute the values into the above formula

That's

A = 12000 ({1 +  \frac{5}{100} })^{3}  \\ A = 12000(1 + 0.05)^{3}  \\ A = 12000 ({1.05})^{3}

We have the answer as

<h3>Amount = Rs 13891.50</h3>

Compound interest = 13891.50 - 12000

<h3>Compound interest = Rs 1891.50</h3>

Hope this helps you

8 0
3 years ago
Which figure is NOT a polygon?
alexdok [17]

Answer:

A.

Hope It Help

Step-by-step explanation:

Brainliest please

5 0
2 years ago
Read 2 more answers
Other questions:
  • HELP ME FOR NUMBER 16
    5·1 answer
  • Find the total surface area of this cuboid.<br> Height=4.8 <br> Width=3.1 cm<br> Length=7.2 cm
    6·1 answer
  • What is the equation of the linear function represented by the table?
    8·1 answer
  • Your docter prescribes you to take 400 milagrams every 8 hours.How many ounces of medicene do you take in a day?
    12·1 answer
  • What is 300% of 12???
    9·2 answers
  • What is the domain and range of f(x)= |x+6|
    11·2 answers
  • When making a book cover, Anwar adds an additional 20 square inches to the surface area to allow for overlap. How many square in
    11·1 answer
  • Lauren invests money in an accout paying simple interest.She invests $50 and no money is added or removed from investments.After
    7·1 answer
  • Working together, two pumps can drain a certain pool in 3 hours. If it takes the older pump 9 hours to drain the pool by itself,
    7·1 answer
  • A store is selling pretzels for $1.35each. If the store sells 5 pretzels, howmuch money will they receive?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!