(GEOMETRY) Can anyone answer these correctly (if you can put how you solved but not mandatory) i will award any troll answers will be flagged/reported.

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

Define multiplicative inverse. give an example of a number and its multiplicative inverse.

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1