Which is equivalent to 80 superscript one-fourth x?

What is the average rate of change for this function for the interval from x=2 to x=4 ?

16. you're planning to buy a boat, a motor, and some miscellaneous boating equipment. the boat costs $325, the motor costs $225, and the equipment costs $79. if you've saved $438 toward these purchases, how much more do you need to save? a. $181 b. $281 c. $291 d. $191

How do i do this activity, is appreciated