Write the sum without sigma notation. then evaluate. summation from k equals 1 to 5 cosine k pi

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Do,h = (7, 9) (14, 18) the scale factor is

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?