Please helppp what?!?!?!

When a valve is open 281 gallons of water go through it in one hour the number of gallons that would go through in 94 hours is

Solve the equation 1. x-3/4=2 4/52. -1/3x-11= -20 3. -12+5/7x= -19

Sam sells not necklaces for $10 each. each necklace cost her $5 to make. she also has $5,000 in fixed costs per year for her jewelry business. how many necklaces must she sell in order to make a profit of $1,000 in one year?