You grab all the items and the total cost at checkout is $46.48. Then the cashier recognizes you because she knows your auntie and gives you the store discount for 15% off, before tax. Then she applies an 8% on the price before the discount was applied. If you paid with a $50 bill, how much change did you receive after making your purchase?

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

what are you trying to solve here

step-by-step explanation:

c. 6tan80

step-by-step explanation: