Solve for d. the question

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.

The cost of using a service is $0.25 per min. what equation correctly represents the total cost c, in dollars, for d days of use?

If f(x) = 6x – 4, what is f(x) when x = 8? a2 b16 c44 d52