Plz someone tell me what 7x2 is

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 does x = in this equation x+3+2x=x+5

What is the volume of a cone with a height of 6 cm in the radius of 2 cm