Answer:
10.21
Step-by-step explanation:
Just cut the piece into two and multiply all the sides
Divide 18 by 2(9) then square that (81). add 81 to both sides
If the squares are 4 inches then the height of the sides will be 4 inches, so you multiply the area of the base times 4!
Well, a linear function is proportional, a straight line (on a graph). And the numbers must not have the same answer. For instance, if the X input is 5, and the Y output is 7. And then another X input is 5, and the Y output is 8, that's non-linear.
So, the Answer would be the third graph. This is because the X values are steadily increasing, and so are the Y values.
For the X and Y values, for each time X increases by 1, Y increases by -8. This is, linear because both sides are constantly and evenly increasing.