{5} is the solution set of
(drop down menu:
x^2-5x+25=0,
x^2+10x+25=0,
x^2-10x+25=0,
x^2+5x+25=0).

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

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.

Julie buys 2kg of apples and 7kg of pears ? 12.70. the pears cost ? 1.30 per kilogram what is the price per kilogram of the apples? show your working out