−4x + 3y = 15, where x is time and y is velocity in kilometers per hour. use this function to determine when a certain particle will reach 40km/hr.

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

Officer brimberry wrote 32 tickets for traffic violations last week, but only 4 tickets this week. what is the percent decrease? give your answer to the nearest tenth of a percent.