How many four-digit numbers can be formed using the digits 1, 2, 3, 4, 5, 6, if a) no digit is repeated?
b) the four-digit number is odd? (Repetition is allowed)
c) the four-digit number is even? (Repetition is not allowed)

step-by-step explanation:

a and d

solve systems of equations by graphing. a system of linear equations contains two or more equations e.g. y=0.5x+2 and y=x-2. the solution of such a system is the ordered pair that is a solution to both equations. to solve a system of linear equations graphically we graph both equations in the same coordinate system

they would have to work 32 hours.