HELP PLEASE! LOTS OF POINTS: How many distinct positive integer factors would the following product have: 21 times 36 times 51?

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers