Tom had the following scores on math tests: 91, 95, 87 and 83. He has one more test this marking period. What is the lowest grade he can receive if he hopes to raise his average above 90?

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?

Place the following steps in order to complete the square and solve the quadratic equation,

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?