What is the exact area of a circle with radius 5?

10

25

25π

10π

how do you solve the inequality -2x > -10

divide both sides by -2.

add 10 to both sides

add 2 to both sides.

divide both sides by -2 and reverse the inequality.

Step-by-step explanation:

(1) The formula for the area of a circle of radius r is A = πr².

If the radius is 5 units, then the exact area of the circle is A = π(5 units)², or A = 25π units².

The third possible answer is the correct one.

(2) To solve -2x > -10, we must isolate x.

Divide both sides by -2, remembering that if we divide an inequality by a negative number, we must reverse the direction of the inequality sign:

-2x > -10

   →  x < 5

 -2      -2

The first possible answer is the correct one:  Divide both sides by -2.