What is the common denominator of 1/a + 1/b ath in the complex fraction
1/a - 1/b/ 1/a + 1/b?

Simplify the expression. -2/5(10+15m-20n)

The function v(r)=4/3pir^3 can be used to find the volume of air inside a basketball given its radius. what does v(r) represent

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?