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scoundrel [369]
3 years ago
10

A rock is dropped from a bridge 320 feet above the river. The pathway that the rock takes can be modeled by the equation h= -16t

2+320. How long will it take the rock to reach the river?
Mathematics
2 answers:
Masja [62]3 years ago
7 0

Answer:

288

Step-by-step explanation:

Zigmanuir [339]3 years ago
3 0

Answer: 4.47 seconds.

Step-by-step explanation:

Hi, the rock will reach the river when the height (h) is 0.

So, replacing in the equation given:

h= -16t2+320

Where t is the time  

0= -16t2+320

Solving for t

-320 = -16t2

-320/-16 =t2

20 = t2

√20 =t

4.47 = t

Assuming that t is the time in seconds, the rock will reach the river after 4.47 seconds.

Feel free to ask for more if needed or if you did not understand something.

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PLEASE HELP ME
AleksAgata [21]
Doubled so multiply the dimensions by 2 and plug into the surface are formula.
=376 cm^3
4 0
3 years ago
The scale on a map of the ground floor of a dinosaur museum is 1/3 inches equals 3 feet. It is 7 inches on the map from the gift
Lorico [155]

Answer:

72 feet

Step-by-step explanation:

you'll have to trust me ;)

5 0
3 years ago
BC= <br> I need someone help... anybody know how to do this?
Tems11 [23]
<h3>Answer: 10.99</h3>

Work Shown:

Angle B = 20 is the reference angle

AC = 4 is the side opposite this reference angle

BC = x is the unknown adjacent side

tan(angle) = opposite/adjacent

tan(B) = AC/BC

tan(20) = 4/x

x*tan(20) = 4

x = 4/tan(20)

x = 10.9899 approximately (make sure your calc is in degree mode)

x = 10.99 rounding to two decimal places

BC = 10.99

3 0
3 years ago
How do I Solve for x: -2(x+3)=-2x-6
BlackZzzverrR [31]

Answer:

Step-by-step explanation:

all you need to do is use the distributive property and then you"ll get the answer

8 0
3 years ago
What are these questions i need help
Over [174]

The roots of the equation f(x) = x^2 - 93987 are x = √93987 and x = -√93987

<h3>What are quadratic equations?</h3>

Quadratic equations are equations that have a second degree and have the standard form of ax^2 + bx + c = 0, where a, b and c are constants and the variable a does not equal 0

<h3>How to determine the other roots of the equation?</h3>

The equation of the function is given as:

f(x) = x^2 - 93987

The above equation is a quadratic equation

Express the equation as a difference of two squares

f(x) = (x - √93987)(x + √93987)

Set the equation of the function to 0

(x - √93987)(x + √93987) = 0

Split the factors of the above function equation as follows

x - √93987 = 0 and x + √93987 = 0

Solve for x in the above equations

x = √93987 and x = -√93987

Hence, the roots of the equation f(x) = x^2 - 93987 are x = √93987 and x = -√93987

Read more about roots of equation at

brainly.com/question/776122

#SPJ1

5 0
1 year ago
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