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
fredd [130]
3 years ago
12

**A rock dropped from a 100 foot tower.

Mathematics
1 answer:
mars1129 [50]3 years ago
8 0

Answer:

2.83 s

Step-by-step explanation:

We are given that

h(t)=-16t^2+10t+100

When a rock reached the ground then h(t)=0

-16t^2+10t+100=0

16t^2-10t-100=0

Using quadratic formula

x=\frac{-b\pm\sqrt{b^2-4ac}}{2a}

t=\frac{10\pm\sqrt{(-10)^2-4\times 16\times (-100)}}{2(16)}

t=\frac{10\pm\sqrt{100+6400}}{32}

t=\frac{10+\sqrt{6500}}{32}=2.83

t=\frac{10-\sqrt{6500}}{32}=-2.2

Time cannot be negative .Therefore, negative value of t can not be possible.

Hence, the rock takes 2.83 sec to reach the ground.

You might be interested in
PLEASE HELP! WILL GIVE BRAINLIEST!
Alex Ar [27]
The one in the middle you can tell because when x=0 that is the y intercept and the graph had a y intercept of 4 and the middle graph had 5
6 0
3 years ago
Read 2 more answers
The compound interest on a certain sum of money for 2 years is $208 and the simple interest for the same time at the same rate i
dlinn [17]
The answer is 208+200=408
7 0
2 years ago
We cannot hear echo in a small room, why ?​
Digiron [165]

Answer:

yyyjhjjhmhjmhd

Step-by-step explanation:

3 0
2 years ago
Compare 5,000 and 500
tamaranim1 [39]
5,000 is 10 times greater than 500
4 0
3 years ago
What is 6.9 × 107 written in standard form?
mihalych1998 [28]
6.9 x 10⁷ is a scientific notation.

6.9 x 10⁷ in standard form is 69,000,000

Scientific notation is used to represent very large numbers or very small numbers.

Scientific notation has three parts. Its parts are the coefficient, base of ten, and the exponents.

6.9 is the coefficient
10 is the base of 10
7 is the exponent

The must always be 1 digit before the decimal point in the scientific notation.
The exponent tells us the number of places the decimal point has moved. Its sign tells us the direction of the decimal point's movement.

Since the exponent is positive, it tells us that the decimal point moved from right to left.

69000000. to 6.9000000

If the exponent had a negative sign, it means that the decimal point moved from left to right.

example: 6.9 x 10⁻⁷
its standard form would have been .00000069


3 0
2 years ago
Read 2 more answers
Other questions:
  • X + y is rational, must x and y each be rational
    15·2 answers
  • How many square feet of outdoor carpet will we need for this hole
    8·1 answer
  • The Godari family is planning to build a new patio in their backyard. They haven’t decided how big it will be, but they know the
    8·1 answer
  • Someone pls help me!! and thank you if you do !
    13·1 answer
  • The results of a two-factor analysis of variance produce df = 2, 36 for the F-ratio for factor A and df = 2, 36 for the F-ratio
    11·1 answer
  • What is the value of x?<br><br> x= <br> units
    12·2 answers
  • Solve algebraically 16 = 64 - 32t
    8·2 answers
  • I need an answer please
    5·2 answers
  • The length of a rectangle is 2cm less than twice the width. If y represents the width, state the inequality that the area of a r
    6·2 answers
  • The nearest hundred to 83,752,245 is?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!