Which system of equations has exactly one solution? 2 x + y = 3. 5 x minus y = 11. 2 x + 2 y = 1. Negative 2 x minus 2 y = 1. 3 x + y = negative 1. 6 x + 2 y = negative 2. 3 x minus 2 y = 4. Negative 3 x + 2 y = 4.

Dropping less than two inches per mile after emerging from the mountains, a river drains into the ocean. one day's discharge at its mouth, 5.6 trillion gallons, could supply all of country a's households for seven months. based on this statement, determine how much water an average household uses each month. assume that there are 100 million households in country a. country a uses approximately nothing gallons per household per month.

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?