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
klemol [59]
4 years ago
12

WILL GIVE BRAINIEST A ball is thrown from a height of 45 meters with an initial downward velocity of 5/ms. The ball's height h (

in meters) after t seconds is given by the following. =h−45−5t5t2 How long after the ball is thrown does it hit the ground?
Mathematics
1 answer:
Zinaida [17]4 years ago
6 0

Answer:

2.16 s

Step-by-step explanation:

When it hits the ground, height h=0 hence

0=45-10t-5t^{2}

5t^{2}+10t-45=0

t^{2}+2t-9=0

Using quadratic formula

x=-1+\sqrt 10\\ x=-1-\sqrt 10

Since time can't be negative, -1+\sqrt 10

t=2.16 s

You might be interested in
-5 1/4- [7 1/2] fractions btw
Lerok [7]

The answer is - 12 3/4 ( negative twelve and three fourths)

5 0
3 years ago
1. En una comunidad del Cuzco la Lic. De Salud del Adulto Mayor (60 años a más) reportó los casos de diabetes de los seis primer
VARVARA [1.3K]

Answer:

The problem is about cases of diabetes in old people through months.

The variable is descrete , because it doesn't admit decimal numbers, it represents people, and people are whole numbers.

The frequency table would be

<h3> Months              People</h3>

January                       24

February                     30

March                          20

April                             18

May                             28

June                             12

The total number of people is 132.

The mean would be the total number of people divided by the six months.

\mu = \frac{132}{6} =22

Therefore, the mean is 22 people per month.

Remember that the median is the value at the center of the data set, which is between March and April, so

\frac{20+18}{2}=19

Therefore, the mean is 19.

The third statistical value is determined by the major frequency. So, the data that repeats the most is February, which means that month encloses the majority of people.

8 0
3 years ago
9 x 9 = 5 groups of 9 + ____ groups of 9 =
lukranit [14]
4;81
You subtract 5 from 9 to get 4; 5(9)= 45 9(4)=36 45+39=81
3 0
3 years ago
Please solve<br>x^2+x-6006=0​
Ratling [72]

Step-by-step explanation:

x^2+x-6006=0

x^2+78x-77x-6006=0

x(x+78)-77(x+78)=0

(x-77)(x+78)=0

=>x=77 or x=78

7 0
4 years ago
What is 2^2 pls help me
NISA [10]

Answer:

4

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
Other questions:
  • What will the temperature be in degrees Fahrenheit when it is 80° Celsius outside? (Recall the formula F = (9C 4072-01-01-03-00_
    10·2 answers
  • Solve for k. 2S=n(a+k)
    13·1 answer
  • (5,2),y=2x-3 write and equation of the line that passes through the given point and is (a)parallel to and (b) perpendicular to t
    11·1 answer
  • Need help with this
    7·1 answer
  • This histogram shows the numbers of people who volunteered for community service and the number of hours they worked.
    5·1 answer
  • I NEED HELP :( WILL MARK BRAINLIEST!! NEED HELP ASAP
    13·1 answer
  • Find the value of the variable.
    15·1 answer
  • Need help for geo..will mark brainlist
    10·1 answer
  • Csctheta x tantheta= sectheta
    7·1 answer
  • Tom bought a banner for
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!