What's the least common multiple for x^2-4x-12 and x^2+6x+8

Iq scores for adults age 20 to 34 years are normally distributed according to n(120, 20). in what range does the middle 68% of people in this group score on the test?

Is a positive integer raised to a negative power always positive

Last one and the bottom answer choice is y=(x-4)^2+1 you guys!