My little sis needs it's 10 points.

Pls! does anybody know a shortcut for answering these types of questions in the future?

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 effect would doubling all the dimensions of a triangular pyramid have on the volume of the pyramid? explain your reasoning.