A line of best fit is f(x) = -0.86x + 13.5 for the set of points in the table.

Using the equation for the line of best fit, what is a good
approximation for the value of the function, f(x), when x =
18?

A. -5
B. -2
C. 3
D. 12

im not quite sure if this is right but i got 5.6 oisutuve

step-by-step explanation:

it is true

step-by-step explanation:

all the combinations add up i used   calculator

, 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

just keep asking questions until you have a better understanding.

step-by-step explanation: