Which centers of a triangle can be located outside of the triangle?

What value of x will make the triangles similar by the sss similarity theorem?

Nine more than four times a number is the same as one less than twice the number. find the number?

Suzanne began a trip with 18 1/2 gallons of gas in the gas tank of her car if she hughes 17 3/4 gallons on the trip how many gallons does she have left once she finish the trip