Find the sum of the interior angle measures of a convex 21-gon

Given the expression 2/5 - 4/6, write the addition problem that is equivalent to it

Find the percent of increase from 12 pencils to 18 pencils.

A worker on the production line is paid a base salary of $190 per week plus $1.19 for each unit produced. Write an equation to represent his earnings of $444.66 for a week when he produced x units. How many units did he produce? Use pencil and paper.

Why doesn't the existence of a correlation always indicate a cause and effect relationship?

Find 2a (3 - b) if a = 4 and b = 5. Show all work for full credit.

A coach on a basketball team ordered jerseys for each player. Each one cost $12.95. The shipping charge for the entire order was a one-time fee of $20. The coach spent under $125 for the shirts and the fee.

A type of ribbon costs $0.32 per yard. How much do 4.5 yards of the ribbon cost?

Between which two square roots of integers could you find π?

A fraction with a zero in the numerator equals

Trella Alcala deposited 1950.00 in a new credit union savings account on the first of the quarter. The principal earns 4.25 percent interest compounded quarterly. What was the amount in her account at the end of the 6 months?