What has a bed but never sleeps? And 35x + 21x = ? (cover up question)

(free points) :D

Arefrigeration system at your company uses temperature sensors fixed to read celsius (°c) values, but the system operators in your control room understand only the fahrenheit scale. you have been asked to make a fahrenheit (°f) label for the high temperature alarm, which is set to ring whenever the system temperature rises above –10°c. what fahrenheit value should you write on the label

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Solve the following inequalities and show the solution on a number line. 3/4 (2x-7) ≤ 5