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
Amiraneli [1.4K]
3 years ago
13

A rock falls off a balcony. It's height (in feet) is given by the formula f(x)=-16t^2+13.4t+120, where t in measured in seconds.

How long will it take the rock to hit the fround? Round your answers to the nearest three decimal places.
Mathematics
2 answers:
nevsk [136]3 years ago
8 0

Answer:

equate f(x) to zero to find the time t

-16t² +13.4t +120 = 0

Using the quadratic formula

t = -b ± √b² - 4ac/2a

a = -16t b = 13.4 c = 120

t = -13.4±√(13.4)² - 4(-16)(120)/-32

= -13.4 ± √ 7859.56/-32

t = - 2.35 or t = 3.19

Since time is positive

t = 3.19s

Hope this helps.

natima [27]3 years ago
5 0

Answer:

-16t² + 13.4t + 120

= ( t-3.189)(t+2.352)

t = 3.189s or t = -2.352s (ignore)

ignore -2.352s because time cannot be in negative form

You might be interested in
What type of measurement would you use to describe the amount of water a pot can hold
Inga [223]
You would use "cups"
5 0
3 years ago
Simplify this i need help
Temka [501]

Answer:

Step-by-step explanation:

√2x(7 + √2x)

7√2x + √2x ·√2x

7√2x + 2x

or

2x + 7√2x

A is the answer

6 0
3 years ago
Where r is the radius of the cone's base and h is the height of the cone. Find the approximate volume of a
postnew [5]

Answer:

The volume of this cone is V = 50 (~50.27)

(I'm assuming that 'his' is height?)

8 0
3 years ago
PLS HELP! I WILL GIVE BRAINLIEST TO BEST ANSWER! Just number 2. Pls exlpain your work. Doesn't have to be like an essay, just en
Leona [35]

Answer:

D

Step-by-step explanation:

If you solve you will find out that its D

6 0
3 years ago
Zoey can tile 1 1/4 square yards in 1/3 hour. What is her unit rate?
alukav5142 [94]
We know that Zoey can tile 1.25 square yards in 20 minutes (which is 1/3 of an hour) so we wanna see how much she can tile in an hour. Multiply 1.25 by 3.

1.25•3= 3.75 or 3 3/4
5 0
3 years ago
Other questions:
  • Break apart ones to make a ten.Then add and write the sum 62+9
    7·1 answer
  • A birthday is divided into 12 equal parts. Andrew eats 3/12 of the cake and Timothy eats 1/12
    8·2 answers
  • Sam drove 320 miles in 2.5 hours, how long will it take to drive 500 at the same rate (speed)?
    7·1 answer
  • Five times a number is less than 6 more than four times the number.<br> translate into math
    15·1 answer
  • 3x+10+70=180 I'm supposed to find the value of x
    8·2 answers
  • circle q is centered at the origin with radius r point p(xy)lies on circle q make conjecture how can you find an equation relati
    12·1 answer
  • Which one of the following statements is true of perpendicular lines? A. They intersect to form an obtuse angle. B. They interse
    5·1 answer
  • PLEASE HELP THIS IS DUE IN AN HOUR!!!
    14·1 answer
  • Long division with 2,000 divided by 3.2
    14·1 answer
  • Six people wen put to dinner, split the check, and paid $18. How much was the check
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!