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
Studentka2010 [4]
2 years ago
13

Martin throws a ball straight up in the air. the equation h(t) = -16t^2 + 40t + 5 gives the height of the ball, in feet, t secon

ds after martin releases it.
how many seconds before the ball martin threw hits the ground?
show your work.
(pls answer asap!!)
Mathematics
1 answer:
Lisa [10]2 years ago
4 0

Answer:

2.62 seconds

Step-by-step explanation:

Let

t ----> the time in seconds

h(t) ----> he height of the ball, in feet

we have

h(t)=-16t^2+40t+5

we know that

When the ball hits the ground, the height is equal to zero

so

-16t^2+40t+5=0

The formula to solve a quadratic equation of the form

at^{2} +bt+c=0

is equal to

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

in this problem we have

-16t^2+40t+5=0

so

a=-16\\b=40\\c=5

substitute in the formula

t=\frac{-40\pm\sqrt{40^{2}-4(-16)(5)}} {2(-16)}

t=\frac{-40\pm\sqrt{1,920}} {-32}

t=\frac{-40+\sqrt{1,920}} {-32}=-0.12\ sec

t=\frac{-40-\sqrt{1,920}} {-32}=2.62\ sec

therefore

The solution  is t=2.62 seconds

You might be interested in
Anais bought 2% yards of ribbon. She had 1 feet 6 inches of ribbon left after trimming some curtains. How many
noname [10]

Answer:

18 inches of ribbon

Step-by-step explanation:

that is the procedure above

8 0
2 years ago
Allie is deciding to take her vacation she wrote each year on a separate piece of paper...
rosijanka [135]
The answer is J, 23/100.
3 0
3 years ago
Free points: this is because of all the kindness I have seen on brainly:
const2013 [10]

Answer:

10x10= 100

Step-by-step explanation:

thx for the points

hope you have a wonderful dayyy

3 0
3 years ago
Read 2 more answers
Solve the formula: V = 1/2 (bh) H for h
Semmy [17]
Times both sides b 2
2V=(bh)H
remember associative property
(ab)c=a(bc)
and
ab=ba
so
(bh)H=h(bH)

2V=h(bH)
divide both sides by bH
\frac{2V}{bH} =h
8 0
3 years ago
Round 18.2044986022 to the nearest hundred-thousandth.
postnew [5]

Answer:

The answer is 18.2.

Step-by-step explanation:


6 0
3 years ago
Read 2 more answers
Other questions:
  • What is the approximate value of y - x
    11·2 answers
  • If y varies directly as x and y is 180 when x is n and y is n when x is 5, what is the value of n?
    15·2 answers
  • The graph below shows the total cost for lunch, c, when Will and his friends buy a large salad to share and several slices of pi
    5·2 answers
  • What is the cube root of 216x^9y^18?
    11·1 answer
  • Find the the simplest form of 325/1000
    15·2 answers
  • At the store 6 pounds of bananas cost $1.95. Enter the amount of 18 bananas would cost.
    14·1 answer
  • Use the limit definition of the derivative to find the instantaneous rate of change of
    15·1 answer
  • 2.
    15·1 answer
  • Write the fraction as a decimal and a percent 42/100
    7·2 answers
  • Classify each graph as increasing, decreasing, constant
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!