What is (3.1 x 10^5) (2.2x10^7) in scientific notation?

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.

(-y to the power of 2 - 4y- to the power of 2 -6 y +3)

Which of the following exponentially equations is equivalent to the logarithmic equation below?