Urgent, no explanation for multiple choice questions

Question 1 (1 point) The statement "Whether or not lim f(x) exists, depends on how f(a) is defined." is true x -a sometimes always O neverQuestion 2 (1 point) If a function f is not defined at x = a, the limit (as x approaches a)... 0 cannot exist 0 must approach 1 0 all of the answers 0 none of the answers 0 could be 0 Question 3 (1 point) Which of the following changes represents a positive rate of change? 0 The change in temperature of water being cooled over time 0 The change in fuel economy as a vehicle increases its speed 0 The change in average monthly temperature in Canada from July to September. 0 none 0 The change in tension ofa spring as the spring is released Question 4 (1 point) An object's position, s, in metres with respect to time, t, in seconds is given by the formula: 3 = 21:2 2. What is the rate of change of the object from O to 5 s? Question 5 (1 point) Rationalize the denominator and simplify. Assume that variables represent positive numbers. Vin Vm - 21n A) 7mn- 7nv3 B) ~7mn + 21 C) V7mn - 7nv3 m - 7n D) V7mn + 7n1 +f( x > O 2- 1 2 3 O1 O2 Oo Does not existQuestion 11 (1 point) What is the limit of the function as x approaches 1 from the right? 4 :s O -2 O 4 O DNE O 6 Question 12 (1 point) What is the limit of the function as x approaches 6 from the right? 4 :s O 5 O DNE O 5.5 O 2 Question 13 (1 point) Does the limit exist at x = 1 ? O Answer cannot be determined