Ben, an experienced kayaker, can paddle his kayak at the constant rate of k miles per hour there is no current in the water. when he paddles his kayak against a current speed c, in miles per hour, that current acts as a transformation on his speed.

7x+8y=-18, 4x-9y=-3 solve the system of equations

Each of the walls of a room with square dimensions has been built with two pieces of sheetrock, a smaller one and a larger one. the length of all the smaller ones is the same and is stored in the variable small. similarly, the length of all the larger ones is the same and is stored in the variable large. write a single expression whose value is the total area of this room. do not use any method invocations.

Mrs. morton has a special reward system for her class. when all her students behave well, she rewards them by putting 3 marbles into a marble jar. when the jar has 100 or more marbles, the students have a party. right now, the the jar has 24 marbles. how could mrs. morton reward the class in order for the students to have a party?