With this question! i'm stuck on it and it's due on the 14th!

Which of the following expressions is equal to 2x^2+8

What is the y-intercept of the line given by the equation

The median of a data set is the measure of center that is found by adding the data values and dividing the total by the number of data values that is the value that occurs with the greatest frequency that is the value midway between the maximum and minimum values in the original data set that is the middle value when the original data values are arranged in order of increasing (or decreasing) magnitude