Noel rides his bike in 270 minutes. What is the average speed in mph

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Show algebraically that f and g are inverse functions f(x)=x^2/-6; g(x)=square root of 2x+12

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.

How can you tell when x and y are not directly proportional?