What are the solutions to the system of equations? {y=2x2+6x−10
y=−x+5

Choice of answers
(2.5, 2.5) and (−3, 8)
(−5, 10) and (3.5, 1.5)
(1.5, 3.5) and (−5, 10)
(1, 4.5) and (−4, 4)

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?