Which of the following best describes the blue line in the image below

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.

Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

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