Afish tank contains 1/2 as many goldfish as mollies, and there are 6 more guppies than goldfish. if the total combined number of fish in the tank is 22, how many mollies are in the tank?
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Which graph corresponds to the function f(x) = x2 + 4x – 1?

Is the power produced directly proportional to the wind speed, give reasons for your answer?

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.