please answer all the questions ssince it's a lot of points and I don't have any more remaining. I will be marking as brainliest​. I need the step by step answers. please don't attach any links, blank files or blank answers. thank you so much​

Clara schumann is buying bagels for her coworkers, she buys a dozen bagels priced at $5.49 a dozen. the bakery's cost for making the bagels is $2.25 per dozen. what is the markup rate based on selling price on a dozen bagels?

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8

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?