In a class test containing 25 questions, 4 marks are given for every correct answer and (-2) marks are given for every wrong answer. A Student attempts all questions and 20 of his
answers are correct. What is the total score of student?​

The input to the function is x and the output is y. write the function such that x can be a vector (use element-by-element operations). a) use the function to calculate y(-1.5) and y(5). b) use the function to make a plot of the function y(x) for -2 ≤ x ≤ 6.