You have a ribbon that is 6 7/8 inches long. You use 2/5 of it on a project. How much ribbon is left?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

An investment decreases in value by 30% in the first year and decreases by 40% in the second year. what is the percent decrease in percentage in the investment after two years

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.