Answer:
-23
Step-by-step explanation:
-8+(-15) means that you are subtracting 15 from -8. So you end up with -8-15=-23.
Let's represent the number with k. The equation is
1/2k+6=1/3k
1/2k-1/2k+6=1/3k-1/2k
6=-1/6k
6/ -1/6=-1/6k /-1/6
-36=k
Therefore the number is -36
to get the equation of any straight line, we simply need two points off of it, let's use the points from the picture below.


if we already have the slope, and we can see the y-intercept on the table, then we can simply use the slopel-intercept form and plug both of them in.

Area of rectangle = length x width
6 x 3 = 18
area of triangle = base x height over 2
2 x 6 = 12
12 / 2 = 6
triangle 2
3 x 3 = 9
9 / 2 = 4.5
add everything together
4.5 + 6 + 18 = 28.5 m^2