Determine if the lines are parallel, perpendicular, or neither for A.

y=5x-7
x+5y=-10

B.

y=-2x+3
-3y=6x+15

C.

3x+4y=4
4x+3y=-21

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.

The complement of an angle is one-sixth the measure of the supplement of the angle. what is the measure of the complement angle?

Stefanie is painting her bedroom. she can paint 2 1/3 square feet in 4/5 of an hour. how many square feet can she paint in one hour?