How would you say "I like that you are here"?
The Spanish phrase for "I like" is "Me gusta", almost meaning "It pleases me". 'Me gusta' has to do with emotion and feeling, so the following verb that you'll use as part of the clause will be subjunctive. So, overall we have "Me gusta que estés aquí."
What is the total distance traveled of point x from t=1 to t=8 if x=t^2+2?
We know where x is when we know what t is because of the equation we have been given. An integral of the equation from t=1 to t=8 will tell us how long it travels between those two times. If we integrate the equation, we will have dx=2t dt, and plugging in the t values can know that x travels 14 units during that time.
I am confused how I'll be able to do these math problems quickly enough to finish in time. How can I be faster at these questions?
Your most important tool in test-taking is to be able to access the great knowledge you have and put it on the paper. You know how to solve nearly all of these problems, and believing that and choosing to approach this test in a relaxed, confident way will greatly help you increase your score.