What is 1/2 x=5/4 solved in an equation

Your food costs are $5,500. your total food sales are $11,000. what percent of your food sales do the food costs represent?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Which questions would most a reader identify the author's purpose for writing? check all that apply. what type of text is this? what type of reviews did the book receive? how many copies of the book have been sold? what is the central idea? how does this text make one feel?