So here's information before I say the question The sale was 50 percent off. And the sales price was 21 dollars

It is asking "what was the original price of a bookcase whose sale price is $21?"

This question awards 100 ! i really don’t want to fail i will also mark you !

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

What number line represents the solution set for the inequality -1/2 greater than or equal to 4