Anyone who helps with either question will get brainliest need answers ASAP

Does the problem involve permutations or? combinations? do not solve. the matching section of an exam has 4 questions and 7 possible answers. in how many different ways can a student answer the 4 ? questions, if none of the answer choices can be? repeated?

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Find the number of real number solutions for the equation. x2 + 5x + 7 = 0 0 cannot be determined 1 2