The height of a triangle is 5 m less than its base. the area of the triangle is 42 m².

what is the length of the base?

A=bh/2, h=b-5 so

A=(b/2)(b-5)

A=(b^2-5b)/2  and A=42 so:

(b^2-5b)/2=42

b^2-5b=84

b^2-5b-84=0

b^2-12b+7b-84=0

b(b-12)+7(b-12)=0

(b+7)(b-12)=0 and since b>0

b=12m

3units/ 5 feet = 60 units/ 100 feet3 units/ 5 feet = 18 units/ 30 feetthe dimensions of the scale drawing are 60 units by 18 units.hope this !