I need help with these 3 problems please, and please provide very detailed explanations for each problem.

Evaluate the following limit. Enter the exact answer in fraction form, if necessary. To enter oo in your answer field, . When you are in text entry mode [when your answer field has just one line], type the word infinity with a lower case i. . When you are in equation editor entry mode [when your answer field has multiple lines with the equation symbol menu bar], choose the symbol oo to enter oo. You can switch entry modes by clicking on the button with the upper case Greek letter 3 next to the answer field. - 2.1: = mrhriloo $2 _4;c+3 ll @ IE Determine the values of a where the function f (@ ) is not continuous. Label each discontinuity as removable, jump or infinite. f (x) = 4 at1 2>4 Enter your answers as integers in increasing order. If there are no discontinuities, enter NA in both response areas and select continuous in both drop-down menus. If there is only one discontinuity, enter NA in the second response area and select continuous in the second drop-down menu. Click for List C= Click for List\f