3 years ago

Pleeaaassseeeees help,

Mathematics

1 answer:

sattari [20]3 years ago

5 0

Hey there!

Since you probably have better things to do, your answer would be A: π(3)²

To back up my answer, the formula to find the area of a circle is π · R² where R = Radius. In that formula then, you just plug everything in. Since the radius is 3, you would put 3 into the "( )". Finally, just plug the rest of the equation in!

I'm open to any question or comment!

God Bless!

-X8lue83rryX

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the length of a rectangle is five feet less than its width. If the area of the rectangle is 84 square feet, find its dimensions

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Let
x---------> the length of the rectangle
y--------> the width of the rectangle

we know that
A=84 ft²
[area of rectangle]=x*y-----> 84=x*y-----> equation 1
x=y-5------> equation 2
substitute 2 in 1
84=[y-5]*y-----> 84=y²-5y---------> y²-5y-84=0

using a graph tool-----> to resolve the second order equation
see the attached figure

the solution is
y=12
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the answer is
the length of the rectangle is 7 ft
the width of the rectangle is 12 ft