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
riadik2000 [5.3K]
3 years ago
14

Keisha throws a rock down an old well the distance D in Feet The Rock Falls after T seconds can be represented by D =16t ^ 2 + 6

4t if the water in the well is 80 ft below ground how many seconds will it take for the rock to hit the water?​
Mathematics
1 answer:
sesenic [268]3 years ago
7 0

Answer:

<em>1</em><em> </em><em>second</em><em> </em>

Step-by-step explanation:

<em>16t</em><em>^</em><em>2</em><em>+</em><em>64t</em><em>=</em><em>80</em>

<em>16t</em><em>^</em><em>2</em><em>+</em><em>64t-80</em><em>=</em><em>0</em>

<em>64</em><em>^</em><em>2-4</em><em>(</em><em>16</em><em>)</em><em>(</em><em>-80</em><em>)</em>

<em>9216</em>

<em>-64-96</em>

<em>______</em><em> </em><em>=</em><em> </em><em>-5</em>

<em> </em><em> </em><em> </em><em>32</em>

<em>-64</em><em>+</em><em>96</em>

<em>_______</em><em> </em><em>=</em><em> </em><em>1</em><em> </em><em>sec</em>

<em> </em><em> </em><em> </em><em> </em><em>32</em>

You might be interested in
Solve the equation<br><br> 1.6=7.6-5(k+1.1)
zepelin [54]
7.6 - 5(k + 1.1) = 1.6

7.6 - 5(k + 1.1) - 7.6 = 1.6 - 7.6

-5(k +1.1) = -6

-5(k + 1.1) -6
-------------- = ---------
-5 -5

k + 1.1 = 6
-----
5

k + 1.1 - 1.1 = 6
----- - 1.1
5

k = 0.1
8 0
3 years ago
PLEASEEE HELPPPP ASAPPPP
stellarik [79]

\cos 27^{\circ} = \dfrac{KL}x\\\\\implies \cos 27^{\circ} = \dfrac{6.3}x\\\\\implies x = \dfrac{6.3}{\cos 27^{\circ}}=7.1~ \text{units.}

6 0
2 years ago
Which expression is rational? A. 4.121221222… B. square root of 36 C. square root of 21 D. 1.192744502…
Sati [7]

Answer: 2

Step-by-step explanation:

4 0
3 years ago
In AVWX, x = 5.7 inches, v = 4.5 inches and ZW=114°. Find the area of AVWX, to the
Rus_ich [418]

Answer:

144 i think

Step-by-step explanation:

4 0
3 years ago
A spinner is divided into 8 equal sections, and each section contains a number from 1 to 8. What is the probability of the spinn
timurjin [86]

Answer:

B.   1 over 8

Step-by-step explanation:

To determine the probability of the spinner landing on 5, we need to first know what probability is,

probability = required outcome/all possible outcome

since the spinner is divided into 8 equal sections and each section contains number from 1-8, this implies there are total of 64 numbers on the spinner.  This implies that all possible outcome = 64

In each section there is 5, since there are 8 sections on the spinner, the number of 5's on the spinner are 8.

This implies that the required outcome = 8

but

probability = required outcome/all possible outcome

probability (of the spinner landing on 5) = 8/64    =1/8

4 0
3 years ago
Other questions:
  • X - 3 &gt;7<br><br> Quick pls answer
    5·2 answers
  • Solve for x, ax^2+bx+c=0
    15·1 answer
  • Rewards for answering the question below will be in place.
    6·2 answers
  • A town doubles it’s size every 35 years if the population is currently 5,00, what will be the population be in 140 years?
    14·1 answer
  • 4. Kevin has $24 to buy a gift for his cousin.
    10·1 answer
  • How do these triangles compare?
    10·2 answers
  • How do you write 2sin5cos5 as a single trigonomic ratio?
    11·1 answer
  • The following equation is proportional?<br> y= 2r + 10<br> O True<br> O False<br> they
    7·1 answer
  • PLEASE HELP which number line represents the solution to |x-5|&lt; 3 ?
    15·1 answer
  • Water leaks from tanker at a rate of 8L/h. How much water will leak from the tank in: a: 2 Day. b: 2 Weeks
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!