Henry teaches gymnastics. He charges a one−time processing fee of $15.00 and the cost of each class is shown below. Let x represent the number of classes and y represent the cost of classes. Based on this information, what will it cost, in dollars, to take 5 classes? (Do not put a $ in your answer.)

Cost of classes (not including processing fee)
Number of Classes, x 1 2 3 4
Cost of Classes, y $12.00 $31.00 $50.00 $69.00

I just need an answer

Question

Henry teaches gymnastics. He charges a one−time processing fee of $15.00 and the cost of each class is shown below. Let x represent the number of classes and y represent the cost of classes. Based on this information, what will it cost, in dollars, to take 5 classes? (Do not put a $ in your answer.) 


Cost of classes (not including processing fee)
Number of Classes, x	1	2	3	4
Cost of Classes, y	$12.00	$31.00	$50.00	$69.00

I just need an answer

espex · Answer

Looks like an arithmetic series. Have you figured out the step of the series yet?

espex · Answer

$$a_n=a_1+(n-1)d$$ where 
$$a_n ~~is~the~value~of~the~term~you~want.$$$$a_1~ ~is~the~first~term$$$$n~ ~is~the~term~you~want$$$$d~ ~is~the~difference~between~terms$$

anonymous · Answer

no could you explain it

espex · Answer

If you take the second number and subtract the first, then the third and subtract the second, then the fourth and subtract the third, you will be able to calculate the difference between the terms.