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IRINA_888 [86]
3 years ago
5

A circular piece of glass has a radius of 2.1 meters. The glass sells for $1.70 per square meter. What is the total cost of the

circular piece of glass?
Mathematics
2 answers:
Neko [114]3 years ago
7 0

We know that 2.1 is our radius. We will square it and then multiply it by 3.14.

2.1²=4.41

4.41(3.14)≈13.85

Our area is about 13.85. Now we will multiply by $1.70 to find the total cost. This gives us about $23.55. The total cost of the glass would be about $23.55.

Vsevolod [243]3 years ago
6 0
Hello! 

To find the total cost, we will need to multiply the cost per square meter, by the total area. To find the area we will use the formula A=<span>πr</span>². We will use 3.14 for pi.

We know that 2.1 is our radius. We will square it and then multiply it by 3.14.

2.1²=4.41
4.41(3.14)≈13.85

Our area is about 13.85. Now we will multiply by $1.70 to find the total cost. This gives us about $23.55.

The total cost of the glass would be about $23.55.

I hope this helps!


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Lori is three times as old as Michelle. In five years Michelle's age will be one half of Lori's age. How old are Lori and Michel
AURORKA [14]

Answer:

Lori's age is 15 years old and Michelle's age is 5 years old now

Step-by-step explanation:

Let

x-----> Lori's age

y ----> Michelle's age

we know that

x=3y-----> equation A

(y+5)=\frac{1}{2}(x+5) ----> equation B

substitute equation A in equation B and solve for y

(y+5)=\frac{1}{2}(3y+5)

2y+10=(3y+5)

3y-2y=10-5

y=5

Find the value of x

x=3(5)=15

therefore

Lori's age is 15 years old and Michelle's age is 5 years old now

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3 years ago
you are given 2 supplementary angles.one has a measure of 4x and the other has a measure of 8x. what is x?
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Answer:

x=15

Step-by-step explanation:

Supplementary angles are two angles that equal the sum of 180 degrees.

Take 4x and 8x and make it equal to 180

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Divide:

x=15

To check:

Plug in 15 to both expressions

4(15)=60

8(15)=120

Add them up and they equal 180 degrees

Hope this helps! :)

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