Alma brought balls of green and blue color. Thirty five percent of balls are blue. If she brought total of 70 blue balls, how many green balls she had?

Kelly is three years younger than her sister. the sum of their ages is 34 years. how old is kelly and how old is her sister?

Thompson and thompson is a steel bolts manufacturing company. their current steel bolts have a mean diameter of 127 millimeters, and a variance of 36. if a random sample of 35 steel bolts is selected, what is the probability that the sample mean would differ from the population mean by greater than 0.5 millimeters? round your answer to four decimal places.

Asquare picture with sides of 32 inches is to be mounted on a square mat with sides of 52 inches. find the area of the mat that will remain uncovered by the picture.