the answer is $34. 36 if I understood your question correctly.
Since the area of a triangle is in the form
area=0.5(base)(height)
height=base+7
let base=x
area=0.5(x)(7+x)
30=3.5x+0.5x^2
multiply the equation by 2
60=7x+x^2
subtract 60 from both sides
x^2+7x-60=0
(x-5)(x+12)=0
thus x=5 or x=-12 since we are only considering positive answers
x=-12 is rejected
so base=5 and height=5+7=12
(x-21)/4
x is the number subtract 21 and divide by 4
Answer:
Felipe work for 6 hours to earn $54
Step-by-step explanation:
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