Which of the following applies the law of cosines correctly and could be solved to find m∠E? Question options:

A)

562 = 312 + 392 – 2(31)(39) ⋅ cos E

B)

562 = 392 – 2(39) ⋅ cos E

C)

D)

cos E = 312 + 392 – 2(31)(39)

1. according to the internal revenue service, the mean tax refund for the year 2007 was $2,708. assume the standard deviation is $650 and that the amounts refunded follow a normal probability distribution. a. what percent of the refunds are more than $3,000? b. what percent of the refunds are more than $3,000 but less than $4,000? c. what percent of the refunds are less than $2,000?