If 578 math majors at a conference comprise 85.1. of all people at the conference, how many people are at this conference

How do i do this? i don’t understand

The measure of an angle is 117°. what is the measure of a supplementary angle?

Complete each statement from the information given and the triangle criterion you used. if the triangles cannot be shown to be congruent, leave the box for the second triangle blank and choose for reason “cannot be determined.” carbon - regular hexagon. ∆can ≅ ∆ by