Answer/Step-by-step explanation:
Given, 
The table for the function are:
When x = -2





When x = -1




When x = 0




When x = 1


When x = 2



Since it's p over four, which is a fraction, multiply each side by four. p = 20
To find the mean (average), we first need to add up all the test scores (14 + 19 + 19 + 20 + 16 + 18 + 15 + 17 + 12 = 150). Then, we need to divide that number (150) by the number of numbers in the data set (9 in this case). So the mean of these test scores is about 16.6666666667.
Linear: y = 4/-7 x + 4
Standard: (4/7)x + y = 4