You send 40 text messages in one month. the total cost is $4.80. how much does each text message cost?

Triangle xyz has vertices x(1,3), y(0,0)

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=

In the following diagram it is given that dec,ab || dc, ad || eb, and ad is congruent to bc. a)why isn't abc a parallelogram even though it has a pair of parallel sides and a pair of congruent sides b)explain why be must be congruent to bc. further explain what type of triangle this makes triangle abc and what it tells you about angle 1 and angle 2c) finally why must angle 3 be congruent to angle 1? further, explain why we know that angle 3 is congruent to angle 2