The Cost to repair a computer was $230. This included $155 for parts and $25 per hour for labor. How many hours of labor we are required to fix the computer?

Let x = number of hours required to fix the computer

$230 = $25x + $155

To solve for x, subtract $155 from both sides.

$75 = $25x

Divide each side by $25

3 = x

It took 3 hours to fix the computer

i'm assuming that it's c.)   volcanoes built the mountains and earthquakes tore them down.

1. 180°. the sum of the interior angles of a triangle is 180°, for the equilateral triangle that it has three equals side is 60°+60°+60°=180°.

2. 60°. each interior angle of a equilateral triangle is 60°

3. 120°. the measure of ∠m is 120°, the sum of the angles ∠m and ∠n is equal to 180°. so, in order to find the measure of ∠m, we have ∠m+∠n=180° > ∠m=180°-∠n > ∠m=180°-60°=120°.

4. 360°. the sum of the exterior angles of an equilateral triangle is ∠m+∠r+∠x=120°+120°+120°=360°. the exterior angles of any triangle always add 360°.