Alibaba purchased flat screen computer monitors from H. P for $275.59 and sells them for $449.99. What is the percent markup based on cost?​

Stephen thublin invests $1,000,000 in a 45-day certificate of deposit with 6.55% interest. what is the total interest income from the investment?

Draw a tape diagram to represent each situation.for some of the situations,you need to decide what to represent with a variable andre bakes 9 pans of brownies.he donates 7 pans to the school bake sale and keeps the rest to divide equally among his class of 30 students

What is the answer to this question? i'm a bit stumped. also how do i do it? 5(x - 4) = 2(x + 5)