Suppose f:N→ N has the rule f(n) = 3n² – 1. (a) Determine whether f is surjection onto N and show why. (b) Determine whether f is injection into N and show why.

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5. If X any Y are sets, then X-Y {rE X: z¢ Y} If X is open set and Y is closed set. Prove that (a) X-Y is open. (b) Y-X is closed. 2 of 3 Exam 2.pdf CE3302 HW5_20...docx exe PDF

* Angles in real-life is everywhere. In fact you can find several angles in your home by performing Learning Task 4. Learning Task 4 由 Instructions 1. Find five things in your home showing angles of different types. 2. Using a protractor, measure the angle in degrees and radians. 3. Identify the angle whether it is acute, obtuse, right, straight or reflex. 4. Give the complement and supplement of each angle ( for acute and obtuse ) 5. Then draw each angle in standard position. 6. An example is shown below to guide you in this task. Measure Туре Complement 55° Supplement 145° 35° 350 ACUTE ANGLE IN STANDARD POSITION