Sweet Tooth Frozen Yogurt has 8 different toppings to choose from. If they add two new toppings, how many ways can Ian choose three?

you already gave the answer

step-by-step explanation:

thats not a system of equations, that is a solution

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.

the answer is 13 cm