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# Either Allison and Betsy come to school , or , if Chloe comes to school , then Daisy comes to school (a,b,c,d) (answer)

A = Allision comes to school B = Betsy comes to school C = Chloe comes to school D = Daisy comes to school (A∧B) ∨(C→D)  Unfortunatey the argument is not complete so you can't really say that the argument is valid

# If i have 3x- 3x do i get x or does it cancel out (answer)

It cancels out. The best way to see this is by factoring out the x giving you x(3-3) = x(0). Anything times zero is zero, so it cancels out.

# If a conversion is as follows: 2 m/hr = mi/min. Does the 2 go with both the numerator and denominator or just the numerator? (answer)

It goes with the numerator

# use the method of subtraction to solve the system of linear equations. 3x - y = 3 and 7x -2y = 10 (answer)

By subtracting you want to eliminate on of the variable so that you are only left with one. In this case it would be easier to get rid of the y. so let multiply the top equation by two and you will get 6x - 2y = 6 7x - 2y = 10.        Subtract them -x = -4 x...

# Consider the equation y=3x+6 and determine what the y-intercept and slope (answer)

The y-intercept is when the line crosses the y-axis, so when x = 0 y = 3(0) + 6 = 6, so the y-intercept is 6 the slope is 3, as you know y = mx + b, m is the slope