A linear function is one whose formula can be written in the form
Ax + By = C where A, B, C are real numbers and A, B are not both 0. (This is standard form, too.)

"Cross multiply."

Subtract 12.

Subtract 2y.

This matches up with standard form with A = 3, B = -2, C = -20.
It's a linear function.
Answer:
19.488
Step-by-step explanation:
8.12 x 2.4 = 19.488
Answer:
7/8
Step-by-step explanation:
1/4×2=2/8....2/8+5/8=7/8
Sum. To build the triangle, start with 1 at the top, then continue placing numbers below it in a triangular pattern. Each number is the numbers directly above it added together.
The model is 1:50 so take 11/5 and multiply it by 50 and you get 110, so the window is 110 inches long