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Vanyuwa [196]
3 years ago
15

Ind the area of a circle whose circumference is 31.4 centimeters. Approximate Π as 3.14.

Mathematics
2 answers:
yaroslaw [1]3 years ago
8 0
The circumference of a circle is found by 2(pi)•r. To find r, set this equal to the circumference they gave you.

31.4=2pi•r

Divide by 2pi

r=4.997

The area of a circle is given by pi•r^2

A=pi(4.997)^2

A=78.460 cm^2
dlinn [17]3 years ago
6 0
31.4/3.14=10
10/2=5
5*5*3.14= 78.5 cm square
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Kelly should get back $6.72.

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1. Jamie purchases gifts for three friends. She chooses a book for $12.80 and then finds two identical necklaces. Her budget is
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Step-by-step explanation:

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3x-4 or = to 7<br><br><br> plz help
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Answer:

3 + 4 = 7  which is true.

Step-by-step explanation:

Whenever you have an equation with a plain variable (that is, no exponent included), there is only one number that will work when substituted for x.

To solve it, you have to "undo" what is done to the variable. You also go in the reverse order of operations, so you do the addition/subtract first, then multiplication/division.

You also have to do the same to both sides, kind of like keeping a balance scale in balance.

In this case, we subtract 4 from both sides first:

3x + 4 -4 = 7 - 4

The + 4 - 4 cancel each other out, so you get:

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3x means "3 times x" so you divide by 3 to undo it. I will use the / to indicate division:

3x / 3 = 3 /3  

so 1x = 1.

Since 1x is "1 times x" it is the same as x by itself, so:

x=1

AND, if we substitute 1 back into the original equation (the asterisk stands for multiply):

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3 * 1 is 3, so:

3 + 4 = 7     which is true.

1 is the only number that works.

Hope this helped.

3 0
2 years ago
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Answer) $312.17 per month, for 9 months to save 4 months worth or expenses.

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