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]
3 years ago
12

Se lanza un objeto desde una plataforma.

Mathematics
1 answer:
jasenka [17]3 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
A way to write numbers by showing the digits 0-9 with each digit having a place value
ExtremeBDS [4]
0 has none and 9 has 9 place value i think lol 


4 0
2 years ago
Can you please help me i give extra if correct!
vazorg [7]

Answer:

Is there a multiple choice?

Step-by-step explanation:

4 0
3 years ago
Rasida ran 5 more miles than 2 times the number of miles Diallo ran this week. Rasida ran 27 miles this week.
Sholpan [36]

Answer:

11

Step-by-step explanation:

Rasida ran 27 miles total.  she ran 5 more miles than double what Diallo ran.

27-5=22

Now divide 22 by 2 to get how many miles Diallo ran.

7 0
3 years ago
Find the area of the figure below
tatuchka [14]

Step-by-step explanation:

(3×6) + (2×6)

= 18 + 12

= 30 in²

4 0
2 years ago
Solve the following proportion for x.<br> x8 = 717<br> Round your answer to the nearest tenth.
My name is Ann [436]
You would divide 717 by 8 which would result in x equaling 89.7
8 0
3 years ago
Read 2 more answers
Other questions:
  • Aria drank 500 milliliters of water after her run.Her best friend Andrea drank 0.75 of liter of water.Who drank more?
    14·1 answer
  • The quesiton is in the picture
    10·1 answer
  • 1.15 GPA and study hours: A survey was conducted on 193 Duke University undergraduates who took an introductory statistics cours
    5·1 answer
  • Every new customer at the Burger Barn qualifies to receive a free whistle. The bag of whistles has 9 black ones, 6 red ones, 7 g
    13·1 answer
  • Please help 60 points for a 4 part question
    8·2 answers
  • Place these real numbers in ascending order
    10·1 answer
  • What is the ratio of purple cylinders to total cylinders, there are 7 purple and 1 yellow.
    7·1 answer
  • Which linear function represents the table<br> PLEASE HELP ILL GIVE BRAINLIEST
    8·1 answer
  • How do you calculate the minimised dimensions: length width and height of a rectangular prism with the given volume of 10m^3?
    8·1 answer
  • Find the x and y intercepts for 3x-3y=12
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!