1 1/2 billion years in scientific notation

Karianne and lucius are analyzing a linear function on a graph. karianne says that unit rate is equal to rate of change, but that slope is calculated differently. lucius says that unit rate, rate of change, and slope are calculated the same way. who is correct? explain your answer.

What is the point-slope form of the equation for the line with a slope of -2 that passes through (1,4)?

Yuto solved the equation below. what is the solution to yuto’s equation?