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
Aleonysh [2.5K]
2 years ago
12

Se lanza un objeto desde una plataforma.

Mathematics
1 answer:
jasenka [17]2 years ago
7 0

Answer:

6 seconds

Step-by-step explanation:

<u><em>The question in English is</em></u>

An object is thrown from a platform.

Its height (in meters), x seconds after launch, is modeled by:

h(x)=-5x^2+20x+60

How many seconds after the launch does the object reach the ground?

Let

x ----> the time in seconds

h(x) ---> the height of the object

we have

h(x)=-5x^2+20x+60

we know that

When the object hit the ground the height is equal to zero

so

For h(x)=0

we have

-5x^2+20x+60=60

The formula to solve a quadratic equation of the form

ax^{2} +bx+c=0

is equal to

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

in this problem we have

-5x^2+20x+60=60

so

a=-5\\b=20\\c=60

substitute in the formula

x=\frac{-20\pm\sqrt{20^{2}-4(-5)(60)}} {2(-5)}

x=\frac{-20\pm\sqrt{1,600}} {-10}

x=\frac{-20\pm40} {-10}

x=\frac{-20+40} {-10}=-2

x=\frac{-20-40} {-10}=6

The solution is x=6 sec

The he object reach the ground at x=6 seconds

You might be interested in
Which fractions have a least common denominator of 36?
lutik1710 [3]

Answer:

The answer is a =3/4 and 5/18

Step-by-step explanation:

5 0
2 years ago
Please help me with this fast cus i need to take a nap asap
GREYUIT [131]

Answer:

66 inches

Step-by-step explanation:

:))

6 0
3 years ago
Read 2 more answers
(05.01)Which equation can be used to calculate the area of the shaded triangle in the figure below?
Lemur [1.5K]
2nd one, take area of whole 12 x 4=48, if area is equally divided, divide area by 2 or multiply by 1/2

7 0
3 years ago
Read 2 more answers
Estimating Areas and Areas of Circles
umka21 [38]

Answer:

1)84 yd

2)63 in

3)7853.98 mm (round as you want)

4)153.94 ft

5)201.06 m

Step-by-step explanation:

3 0
2 years ago
Whoever answers this NOW will get brainliest
gavmur [86]

Answer:

I think is -x + 105/42y

Step-by-step explanation:

2(3/10)x - 5/7y - 4(5/6)y - 2(4/5)x

6/10x - 5/7y - 20/6y - 8/5x

6/10x - 8/5x - 5/7y - 20/6y

6-16/10x - 35+140/42y

-10/10x + 105/42y

-x + 105/42y

5 0
3 years ago
Other questions:
  • An account earns simple interest.<br><br> $5200 at 7.36% for 54 months
    12·1 answer
  • When purchased, a beach ball is deflated and packaged flat. The package states that when inflated to its maximum capacity, the r
    9·1 answer
  • A homeowner wants several small dormers built on his roof to admit light. They will be in the shape of isosceles triangles whose
    12·1 answer
  • Select all true statements for the triangle shown.
    6·2 answers
  • What is x in the equation 2x-8=27​
    9·2 answers
  • Please help me with this
    15·1 answer
  • The slope of the line is 1, and the y intercept is -1. What is the equation of the line written in slope intercept form?
    10·2 answers
  • Write an algebraic expression for each verbal expression. Then simplify, indicating the properties used. 4 times the difference
    10·1 answer
  • She has 42 dogs all together. please help
    9·1 answer
  • Write a rule for the nth term of the geometric sequence:<br> a3=54, a6=1458
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!