1. Compare 2.01 x 1015 and 2.8 x 1013. Which number is larger? But worked out because I am having troubles

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.

Nine more than four times a number is the same as one less than twice the number. find the number?

Which inequality statement describes the two numbers on a number line? "? 7 and a number 5 units to the right of ? 7"