<span>(a) Create a chart of values and write an equation to find the total cost, C in terms of the number of days d.
C = 10d + 20
</span><span>(b) Use the equation you created in Part (a) to find the cost of renting a bike for 5 days. </span> C = 10d + 20 <span>C = 10(5) + 20= 50 + 20 = 70