Abanquet hall has a perimeter of 3600 m. with is the width if the length is 5 times the width?

Can any one me with the answers to these questions asap?

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?