What is the value of x + y + z when 6x + 5y - 2z = -4 and 4x + 5y + 12z = 54? i'm really stuck on this problem. can someone ?

Three cylinders have a volume of 2836 cm^3. cylinder a has a height of 900 cm. cylinder b has a height of 225 cm. cylinder c has a height of 100 cm. find the radius of each cylinder. use 3.14 as an approximate for π

If olu is twice as old as funmi if the sum of their ages is 60 how old is olu

Marquise has 200 meters of fencing to build a rectangular garden. the garden's area (in square meters) as a function of the garden's width w w (in meters) is modeled by: a ( w ) = − w 2 + 1 0 0 w a(w)=−w 2 +100w what side width will produce the maximum garden area? meters