Mr. nolan changes the oil in his car every 4,000 miles. he uses 3 quarts of the oil each time. how many quarts of oil will he have used after 12,000 miles?

I think just add 4000 and 12000 then x the answer with 3

so the possibilities of the measurement of the side of the triangle are either it is longest side or not the longest side

when it is the longest side

s < 25 + 35s < 60

if it is not the longest side

35 < 25 + s10 < sso 10 < s < 60so the perimeter70 < p < 130