two mechanics worked on a car . the first mechanic worked 20 hrs and the second worked 15 hrs. together they charged a Total of $1650. what was the rate charged per hour for each menchanic if the sum of the two rates was $95per hour

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

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?

Starting at home, emily traveled uphill to the hardware store for 606060 minutes at just 666 mph. she then traveled back home along the same path downhill at a speed of 121212 mph. what is her average speed for the entire trip from home to the hardware store and back?