Ivan saves 20% of his monthly music equipment he earned $335 last month. how much did he save for music equipment? if he uses $20.10 of what he earned to buy sheet music what percent of his earnings is this amount?

Jane moves from a house with 71 square feet of closet space to an apartment with 45.44 square feet of closet space. what is the percentage decrease of jane’s closet space?

If a is a nonzero real number then the reciprocal of a is

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?