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Multiplication Problem.

Give Any number a letter from 0-90 but if u give a letter to a letter it will always be the same(E. G D=23. Then a second D will also have to be 23)

Allie answered 72% of the questions on her math test correctly. if she answered 18 questions correctly, how many questions were on the test?

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

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.