Solve x/2 + 2x/5v= 9

please I need it ASAP
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Write each expression in exponential form and find its value.| ! 2 x 2 x 2 x 2

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 to find the exponential function y=ca^x, with points (1,2) and (2,1)