Martha wants to build a rectangular wooden border around the perimeter of her children's playground. She can find the perimeter by using the formula 2w + 2l. The length, l, is 12 feet and the width, w, is 10 feet. What is the perimeter of Martha's wooden border?

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

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.

William invested $5000 in an account that earns 3.8% interest, compounded annually. the formula for compound interest is a(t) = p(1 + i)t. how much did william have in the account after 6 years? (apex)