For what values of x does the function y=2x+13 take on a positive value? a negative value?

Step-by-step explanation:

Given is function linear in x

We have to find when this has a positive value and when negative value

The value which separates positive and negative is 0

First let us equate

Thus this value separates y from positive to negative

Hence takes positive values for all x >-6.5 other wise negative values

At 6.5 it is 0.

518,400

step-by-step explanation:

the area is multiplying all the given measurements together.

40 * 18 * 30 * 24 = 518,400