HELP!! Math textbooks are being sold online for $12 each, plus a one-time handling fee of $3. The total cost is a function of the number of textbooks bought.

Write a function rule to model the cost of the textbooks:

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

What is the factored form of the following expressions? d^2 – 13d + 36

If the discriminant if a quadratic equation is 4 which statement describes the roots?