Pls me asap for and for 9 only! ( explain) + lots of points

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.

What is the solution of log2  (3x  -  7)  =  3? 4 5

Ineed i been stuck on this question since yesterday