7th grade accelerated math / pre algebra
posted by Ardine .
write two equivalent expressions for the area of the figure the figure is a triangle inside the triangle it says x + 4 and the #16 is written along the length of one side of the triangle. The answer is 8(x +4) and 8x + 32 but I don't know how they got it

If the altitude is h=x+4 and the base is b=16, then the area
a = 1/2 bh = 1/2 (x+4)(16) = 8(x+4) = 8x+32 
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