Can someone answer these three questions really quick for me?

What is the value of x in the equation 1.5x+4-3=4.5(x-2)?

Sole the equation 6n + 9 = -3n - 21 - 6 for n

Now, martin can reasonably guess that the standard deviation for the entire population of people at the mall during the time of the survey is $1.50. what is the 95% confidence interval about the sample mean? interpret what this means in the context of the situation where 95 people were surveyed and the sample mean is $8. use the information in this resource to construct the confidence interval.