HELP PLEASE I don't need answer really if there's a similar problem than please show me I just need to know how to SOLVE 100 POINTS What is the value of the expression when x = -2 and y = 4

`45x + -5y`

-110

Step-by-step explanation:

45(-2) + -5(4) = 110

72 is the answer to this problem

, 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