A 154 lb person burns 420 calories per hour riding an exercise bike at a rate of 15 mph. Write a function rule to represent the total calories burned over time by that person. Explain how the information in the problem relates to the function.

How do i work this problem out using the equation a=pe^rt

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

The total cost of anja’s trip to the dentist was $628.35. she paid a flat fee of $89.95 which included the checkup and cleaning and then had 4 cavities filled, each of which cost the same amount. which shows the correct equation and value of x, the cost of each cavity filling?