Answer:
The answer is ten. Perimeter is all the sides added together. Area is length times width.
Step-by-step explanation:
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21 and -4, because -4x21 = -84, and 21+-4 (– 4) = 17
H = height of triangle
b = length of triangle base
A = area of triangle
Recall the formula for area of a triangle :
A = 1/2 bh
Plug in what was given in the problem :
h = b - 5
A = 42
A = 1/2 bh
42 = 1/2 b (b-5)
