Given that 2a-1/2a=6, find 4a²+1/4a²

Which equation has a constant of proportionality equal to 3?

There are 20 questions in a test. the scores of each problem are allocated in the following ways: 2 marks will be given for a correct answer, 1 mark will be given for a blank answer and 0 marks will be given for a wrong answer. find the minimum number of candidate(s) to ensure that 2 candidates will have the same scores in the test.

What is the scientific notation of 78 million