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
Marysya12 [62]
3 years ago
10

A rectangle is 3 times as long as it is wide and its perimeter is 120 centimeters. find area.

Mathematics
2 answers:
MariettaO [177]3 years ago
8 0
The perimeter is the sum of the sides since opposite sides are = in rectangle add 2w+2l let x=width 3x= length 8x= 120 x=15 substitute 15 for x w=15 l= 45 area= l x w 15 x 45 = 675 area = 675 cm.
valentina_108 [34]3 years ago
6 0
The formula for perimeter is 
P = 2l + 2w
In this particular case you are given that the length is three times the width:
3l = w
In this case, you are also given:
P = 120
Therefore,
120 = 2l + 2w
At this point you have a system of equations:
120 = 2l + 2w
l = 3w
Now you can use substitution (plug in 3w for l in the perimeter equation)
120 = 2(3w) + 2w
Simplify:
120 = 6w + 2w
120 = 8w
120/8 = 8w/8
15 = w
Plug in the width into one of your original equations to get the length:
l = 3*15
l = 45
Now you know that l = 45 and w = 15
Now, you plug this information in for your equation for area:
A = l*w
A = 45*15
A = 675
The area of the rectangle is 675 cm²
You might be interested in
Whats the radius of d = 29 m
VMariaS [17]

Answer:

6? .................

..............

5 0
3 years ago
Read 2 more answers
Please help me I don’t understand.
attashe74 [19]

Answer:

1 : 64

Step-by-step explanation:

Model:

1/2 in * 1/6 in = 1/12 in^2

Real:

1/3 ft * 1/9 ft = 1/3 * 12 in * 1/9 * 12 in = 16/3 in^2

model : real

1/12 / 16/3 = 1/12 * 3/16 = 3/192 = 1/64

model : real = 1 : 64

7 0
3 years ago
Which two ratios form a proportion?
earnstyle [38]

Step-by-step explanation:

A ; 2 × 12 = 3×4

B; 2 × 12 = 3×6

C ; 2 × 18 = 3×18

D; 2 × 36 = 3× 12

4 0
2 years ago
1.25+7.5=y graph the equation
ExtremeBDS [4]

Answer:

ajsjsjskkekeoekejjdjdjskakwkkeirud

4 0
2 years ago
Convert StartFraction 3 pi Over 8 EndFraction radians to degrees
dangina [55]

Answer:

67.5 deg

Step-by-step explanation:

A full circle is 2(pi) radians. It is also 360 degrees.

2(pi) radians = 360 deg

pi radians = 180 deg

3(pi)/8 rad * (180 deg)/(pi rad) = 67.5 deg

4 0
2 years ago
Other questions:
  • How do you mark radius on a circle
    5·2 answers
  • A pigeon can fly at a speed of 84 kilometers per hour. How long does it take the pigeon to fly 7 kilometers?
    9·1 answer
  • Find the value of k so that the lines through the given points are parallel.
    11·1 answer
  • Which expression is equivalent to 8c+6-3c-2
    5·1 answer
  • Today's high temperature is 72°F. If yesterday's high temperature was 87°F, what was the change in high temperatures
    11·1 answer
  • Help filler filler filler
    12·1 answer
  • Assume you have a balance of $1,900 on a credit card.
    7·1 answer
  • A ​6000-seat theater has tickets for sale at ​$26 and ​$40. How many tickets should be sold at each price for a sellout performa
    11·1 answer
  • 9. Chocolate Co. mixes two kinds of chocolate bars
    13·1 answer
  • 15x-6y=48 in simplest form
    13·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!