Pre college need help

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.

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

Write the point-slope form of the line passing through (2, -12) and parallel to y=3x.