How can you move just one number to a different triangle to make the sum of the numbers in each
triangle equal? (Hint: There do not have to be
exactly 3 numbers in each triangle.)

Remove 9 from triangle B to A

Step-by-step explanation:

Given

Three Triangles

A: 1,2,3

B: 7,8,9

C: 4,5,6

Required

Make their sum equal

First, we need to calculate the sum in each triangles;

Remove 9 from triangle B to A

At this point, we have:

Hence, the solution is to remove 9 from B to A

what is the starting amount? the question is not clear sorry.

step-by-step explanation:

a. she will receive a refund of $278.

step-by-step explanation: