What is the solution to this system of equations?

One card is dealt from a 52 card deck. find the probability that the dealt card is a 4 or a black 7

Nick and nora are married and have three children in college. they have an adjusted gross income of 47,400. if their standard deduction is 12,600 itemized deductions are 14,200 and they get an exemption of 4000 for each adult and each dependent what is their taxable income

Asmall book publisher knows that 26 books weigh 41 lbs. how much do 40 books weigh?