Plz need it done by 8: 56

our backyard is 50 feet long and 30 feet wide what is the perimeter

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.

8litres of paint can cover 129.6 m². how much paint is required to paint an area of 243m²?

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?