This question that i need to on is unknown angle problems (with algebra)

5, 6, 10 question: a. determine whether the side lengths form a triangle. (explain your reasoning) b. if it is a triangle, determine whether it is a right, acute, or obtuse triangle. (show your work)

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?

Which of the following is equal to the rational expression when x is not equal to -2 or -6?