The sum of two numbers is 7. four times the larger number plus three times the smaller number is 40. find the numbers.

Three times the difference of federico’s age, and 4, increased by 7, is greater than 37. what are possible values of federico’s age?

What is the measure of the smallest angle in the diagram? 15 29 32 45

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.