The perimeter of a rectangle is 20 cm. The length is 7 cm. What is the area?
1 answer:
Hey there!
So we know the perimeter is 20 cm. Let's make our formula for this.
2L + 2W = 20
The formula for the area of a rectangle is L x W. Let's make this into our formula and fill it in as time goes.
L x W
Our Length is measured at 7 cm, so let's fill that into our formulas.
2(7) + 2W = 20
7 * W = x
Let's use some basic algebra to solve for our perimeter.
2(7) + 2W = 20
14 + 2W = 20
2W = 6
W = 3
This means our Width is 3. Now all we have to do is solve for our area since we have our dimensions.
7 x 3 = 21
The area of the rectangle is 21 cm^2.
I hope this helps!
You might be interested in
Answer: 3
(
x
−
8
)
(
x
+
5
)
Step-by-step explanation:
Answer:
-14 plot behind the 15
count back three from 0 to get -3
to get -8 count back from 0 also
Answer: 5
Step-by-step explanation:
8+(-3)
=8-3 ⇔ you don't need to change signs when it is positive(+) outside the parenthesis
=5 ⇔ subtraction
#CarryOnLearning
Each concession stand will receive 197 popcorn bags i used a calculator so it is right.
Answer:
-1/3
Step-by-step explanation:
at x=0 y= 5
at x=3 y= 4
y=ax+b
b= 5
4=3x+5
3x= -1
x= -1/3
