Arecipe that will make 3 pies calls for 7 cups of flour. write a proportion and solve it to find how many pies can be made with 28 cups of flour

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?