A music store marks up the instruments it sells by 30%. a. If the store bought a guitar for 45$ what will be its store price?
b. If the price tag on a trumpet says 104$ how much did the store pay for it?

In the field of thermodynamics, rankine is the unit used to measure temperature. one can convert temperature from celsius into rankine using the formula c= r/1.8 - 273, what is the temperature in celcius corresponding to r degrees rankine.

Of four points are collinear, they are also coplanar

Compute the standard deviation of the following set of data to the nearest whole number. 10, 10, 15, 20, 25