Carlito scored a 92 on his first math test, a 94 on the second, and an 88 on the third. if each test is worth points and there are four tests per year, what will carlito need to score on the last test to have an average of 90 for the year?

What is the absolute value of the complex number -4-sqrt2i

Solve for x where 0 equation: cot^2x+2cotx+1=0

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?