What is the average rate of change for the function f(x)=x^2-3x+6 over the interval of -3

Find the zeros of each function. f(x) = x^2 + 5x - 6

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.

Olga bought a new skirt that cost $20. sales tax is 5%. how much did olga pay, including sales tax? 7.