Answer:
400
Step-by-step explanation:
Multiply each side 2x , add it up and you'll have 400
92400m
<em>Find the volume of the two rectangles.</em>
Volume of a rectangle: length*width*height
The first, larger rectangle: 64*60*28=107520m
The second, smaller rectangle: 18*30*28=15120m
<em>Subtract the two rectangles' volumes for the building's total volume.</em>
107520-15120=92400m
5x + 6y = 20_____(1)
8x - 6y = -46_____(2)
Solving simultaneously:
Eqn(1) + Eqn(2)
5x + 8x + 6y + (-6y) = 20 + (-46)
13x = -26
x = -2
substituting this into Eqn (1):
5(-2) + 6y = 20
-10 + 6y = 20
6y = 30
y = 5
hence:
x = -2,y = 5.
