Over two summers, ray saved $900 and $500. the polynomial 900x2 + 500x represents his savings at the beginning of the third year, where x is the growth factor. (the interest rate r is x - 1.) what is the interest rate he needs to start the third year with $1600 in savings? a. 0.1% b. 1.1% c. 8.4% d. 264%

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.

D. in a discrete probability distribution, the sum of the probabilities for the discrete variables will be > 1. true or false

The image of abc after a reflection across eg is abc