Book Maths Puzzle Algebra

Your teacher is giving you a test worth 100 points containing 40 questions. There are 2-point and 4-point questions on the test. How many of each type of question are on the test?

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Book Other Question

How do you factor:
-4x^3 + 36x^2 - 12?
It is the prime of f(x) = 12x^3 - 12x + 24.

I need to find the intervals where the graph of f is concave upward, concave downward and the inflection points.
Thanks,
Anne
A mother is 6 times older than her daughter is today, and in 20 years from today, the mother will be twice the child's age. What is the daughter's age today? And, what is the equation for solving this problem?