Find m pqr if bt bisects m=rqt (10x-13)

Germaine walks at the rate of 10 feet every five seconds while nolan walks at the rate of 15 feet every five seconds. if germaine has a head start of 25 feet, how many seconds will they be at the same spot?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?

What is the greatest number of parts of a circle that can be formed by cutting the circle with 7 straight cuts? (note: the parts do not have to be equal in size)