Please help and answer all the parts of the question, I’ll give you brainiest!

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*

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?