How much is the sales tax on $19.50 worth of goods if the tax rate is 7%?

Which of the following represents the factorization of the trinomial below? x^2+7x-30

Find the arc length of the semicircle. 7the grade

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?