Aclass has 6 boys and 15 girls what is the ratio of boys to girls

D(5, 7). e(4,3), and f(8, 2) form the vertices of a triangle. what is mzdef? oa. 30° ob. 45° oc. 60° od 90°

Hi, can anyone show me how to do this problem? 100 points for this. in advance

Precalculus question, image attached.