What is the difference of (2.8 * 10^4) - (6.5 * 10^3)

What is the slope of a line that is perpendicular to y = 3x + 1

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

Jane’s favorite fruit punch consists of pear, pineapple, and plum juices in the ratio 5: 2: 3. how many cups of pear juice should she use to make 20 cups of punch?