Michael has a total of 15 bills that are either $1 bills or $5 bills. if the total amount of money he has is $47, how many $5 bills does he have?

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.

ca = ec

cpctc makes it so that corresponding parts of the triangle you proved to be equal are equal, the other options aren't part of the part of the triangles you proved to be equal.