Immediately ? i’m so confused and forgot all about doing this ••

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

The area of square garden is 300m squared. how long is the diagonal?

Mike wants to make meatloaf. his recipe uses a total of 8 pounds of meat. if he uses a 3 to 1 ratio of beef to pork, how much pork will he use? enter your answer as a mixed number in simplest terms.