Is 8 * 10^-2 written correctly in scientific notation

Find the average rate of change for f(x) = x2 − 3x − 10 from x = −5 to x = 10.

What is the y-intercept of the line given by the equation

Seattle, washington is known for being rainy. one day last month, 8 inches of rain fell in 1 1/2 hours. what us the rate of the rainfall expressed in ft per plzzz write a proportion i will give you 100 points