Amy has ridden 28 miles of a bike course. The course is 40 miles long. What percentage of the course has Amy ridden so far?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

What is the value of x in the this question ?

The boiling point of water at an elevation of 0 feet is 212 degrees fahrenheit (°f). for every 1,000 feet of increase in elevation, the boiling point of water decreases by about 2°f. which of the following represents this relationship if b is the boiling point of water at an elevation of e thousand feet? a) e = 2b - 212 b) b = 2e - 212 c) e = -2b + 212 d) b = -2e + 212