The area of a rectangle is 500 in squared. the ratio of the length to the width is 5 : 4. find the length and the width

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14

How do i take any fraction and make it into a decimal or percentage?