cannot decide which of two washing machines to buy. The selling price of each is ​$455. The first is marked down by ​50%. The second is marked down by ​20% with an additional ​30% off. Find the sale price of each washing machine. Explain why should buy the first washing machine rather than the second if the machines are the same except for the selling price.

3x + 4y -25 =0 represents the amount of change sianna should recieve

, 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