Explain why 22-1) = 4(2 +5) has one solution. Choose the best response below. O The coefficients of z are the same, but the constant terms are different.
O The coefficients of z are the same, but the constant terms are the same
O The coefficients of z are the same, and the constant terms are the same
O The coefficients of z are different, and the constant terms are different.

What are “like terms”? why can we only add like terms?

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

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.