Have vehicles gotten more fuel-efficient over the years? between 1960 and 1999 the size and shape of automobiles in the
united states has changed almost annually. the amount of fuel consumed by these vehicles has also changed. the
following table describes the average fuel consumption per year per passenger car in gallons of gasoline.
yeart
1960
568
1970
760
1980
576
1990
520
gallons consumed per
passenger car
1995
530
1997
538
1998
544
1999
552
determine the average rate of change, in gallons of gas per year, from 1960 to 1990,

9.2 gallons

Step-by-step explanation:

the answer is c. 23/3

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc