Lan pays a semiannual premium of $450 for automobile insurance, a monthly premium of $125 for health insurance, and a an annual premium of $500 for life insurance. The monthly expense is $?

X2 + y 2 = 36 x + y = 6 solve the system of equations.

One file clerk can file 10 folders per minute. a second file clerk can file 11 folders per minute. how many minutes would the two clerks together take to file 672 folders?

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?