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)
The average is 13 to get the answer you add all the numbers together then divide by how many numbers you had (ex) 12+18+13+16+6=65 then you divide by how many numbers you have (ex) 65\5=13
Your answer is: 8x^4 y^5/7.
There’s no picture or anything so try again