This is the problem: lisa has x candies, and sophie has three times as many. sophie has candies. sophie has candies more than lisa. sophie and lisa have candies together. you have to fill in this: sophie has _ candies. sophie has _candies more than lisa. sophie and lisa have _ candies together. ps. you have to write an algebraic expression! i need the answer quickly !

-6 + 3 = 3 - 6

, 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