After driving 70 miles, mel used 3.8 gallons of gasoline. after he drove a total of 140 miles, he had used 6.3 gallons of gasoline.
a) find the average rate of change of miles to gallons for miles [0,70]
b)find the average rate of change of miles to gallons for miles [70,140]
c) )find the average rate of change of miles to gallons for miles [0,140].

A) 0.05429 gallon per mile or 18.4 miles per gallon
b) 0.03571 gallon per mile or 28 miles per gallon
c) 0.045 gallon per mile or 22.22 miles per gallon

21.00 per mile and plus 5.50 is 26.50 i think that im pretty sure it is right

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle