Cormac is making 27 phone calls each week as part of a fundraiser. Last week, he made 13 phone calls on weekdays. Which equation could be used to find x, the number of phone calls he made last week on weekend days? A. x - 27 = 13
B. 13 + x = 27
C. x + 27 = 13
D. 27x = 13

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.

The formula for the lateral area of a right cone is la = rs, where r is the radius of the base and s is the slant height of the cone.which are equivalent equations?

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.