Someone, please help

and instead of 10yd its 30yd
and instead of 20yd its 60yd

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.

Abook store is having a 30 perscent off sale. diary of the wimpy kid books are now 6.30 dollars each what was the original price of the books

The average length of a king cobra is 3.7 m. the record length is 1.88 m longer than the average. how long is the record holder?