With respect to PEMDAS, the order of operations is as follows: 1. Parentheses 2. Exponents 3. Multiplication/ Division 4. Addition/ Subtraction Multiplication and Division can be done interchangeably (granted, as long as you have already dealt with all operations in parentheses and exponents, and BE...

A cyclist travels the length of a bike path that is 225 miles long, rounded to the nearest mile. If the trip took him 5 hours, rounded to the nearest hour, then his average speed must be between: A. 38-50 mph B. 40-50 mph C. 40-51 mph D. 41-50 mph E. 41-51 mph My problem does not have to do with act...

Cross multiply to get a common denominator so that you can add the two terms together. For simplicity, I'm just going to ignore the exponent and demonstrate the manipulation: 1/x + 1/y (in order to add these together, we need a common denominator) = (y/y)(1/x) + (x/x) (1/y) (remember, multiplying by...