In the spring of 2008, petrol cost £1.029 per litre in london. on the same day, the exchange rate was $1 = £0.485. what was the price of london petrol in dollars ($) per gallon? (1 gal = 3.7854 l) $8.03 /gal $1.89 /gal $7.80 /gal $1.78 /gal $3.90 /gal

Adriana sold 50 shares of a company’s stock through a broker. the price per share on that day was $22.98. the broker charged her a 0.75% commission. what was adriana’s real return after deducting the broker’s commission? a. $8.62 b. $229.80 c. $1,140.38 d. $1,149.00

Ineed to know the answer to this algebra question.

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.