15. I ordered some books online for myself and my friends. each book cost $11 the store charges a flat rate for shipping of $20. write an expression for the cost of buying n books. 16. How much would I be charged if I purchased 8 books? Explain how you would solve the problem.

Can someone me my sister? she is in third grade. 50 points and brainlist! ones that are not answered. plz and thx!

(01.02 lc) angle abc has point e on ray ba and point d on ray bc. points e and d are equidistant from point b. to bisect angle abc, which of the following needs to be identified for the construction? the distance between points e and d the point in the angle that is equidistant from points e and d the endpoint of rays ba and bc the point outside of the angle that is equidistant from points e and d

In the diagram below? p is circumscribed about quadrilateral abcd. what is the value of x