Factor 12x2+ 4
Factor x2-7x+12

Hi I need these factored please

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Your friend uses c=50p to find the total cost, c, for the people, p, entering a local amusement park is the cost of admission proportional to the amount of people entering the amusement park? explain.

Will mark brainliest! ( explain the answer too, it can be one sentence)