9 because if you subtract 11 from 19 you het 9
Answer:
c = -7
Step-by-step explanation:
c + 10 = 3
subtract 10 on both sides of the equal sign
c = -7
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)
