3x+3-x+(-7)>6
combine like terms on left side
2x-4>6
add 4 to both sides 2x>10
x=10/2 = 5
x>5
X^4 - x^2 + 9 - (x^3 + 3x^2 + 12) =
x^4 - x^3 - 4x^2 - 3
50% is the probability of one landing on tails
T+J=4 hours
x+2x=4 hours
3x=240 minutes
X=80 minutes
