A(r) is a function that gives the area of a circle with radius r. it can be written in equation form as a(r) = 3.14r2. what is the value of a(4)? a. 157.75 b. 25.12 c. 19.14 d. 50.24

Which ordered pair (c,d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

Suppose you are an avid reader and are looking to save money on the cost of books instead of paying about $20 for each book, you decide to look into purchasing a kindle for $120 you can purchase e-books for about $5 each 1. find the slope-intercept equation for the cost of the hard copy of books using x to represent the number of books 2. find the slope-intercept equation for the cost of the kindle with cost of e-books using x to represent the number of books