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naruto63
30.08.2019 •
Mathematics
The first car has a fuel efficiency of 15 miles per gallon of gas and the second has a fuel efficiency of 40 miles per gallon of gas. during one particular week, the two cars went a combined total of 1450 miles, for a total gas consumption of 55 gallons. how many gallons were consumed by each of the two cars that week?
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Ответ:
1st car = x
2nd car = y
x +y = 55 gallons rewrite as x=55-y
15x + 40y = 1450 miles
15(55-y)+40y=1450
825-15y + 40y=1450
825+25y=1450
25y=625
y = 25
x = 55-25=30
1st car used 30 gallons and 2nd car used 25 gallons
Ответ:
Work Shown:
The idea is to replace x with 0 and then use PEMDAS to simplify.
f(x) = 5(x+2)^2 - 10
f(0) = 5(0+2)^2 - 10
f(0) = 5(2)^2 - 10
f(0) = 5(4) - 10
f(0) = 20-10
f(0) = 10