It costs charlie’s car repair shop $27 to change the oil. the shop charges their customers $40 for an oil change. what is the percent of markup in the cost of an oil change?

Aflower has 26 chromosomes. to create a new flower, how many would a sperm cell have what is called?

The federal reserve controls certain interest rates in the united states. investors often try to speculate as to whether the federal reserve will raise or lower rates and by how much. suppose a company conducts extensive interviews with financial analysts, and as a result, predicts that "thefed" will increase rates by an average of 0.25 percentage points every six months for the forseeable future. which type of equation could be used to model the predicted interest rates over the next several years, assuming no other significant changes? a) a linear equation b) a quadratic equation c) a polynomial equation d) an exponential equation

Which expression represents the total perimeter of her sandwich, and if x = 1.2, what is the approximate length of the crust?