exam Maths Puzzle Numerical Ability

A quadrilateral is a parallelogram if its diagonals bisect each other.

This needs to be proven in a two column proof

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exam Other Question

Find the vertex and intercepts for each parabola. Sketch the graph

44. g(x) = x^2 + x - 6

i do not know if this question goes here or not because i do not know how to solve it or what to do. thanks for any help Petrolyn oil is a combination of natural oil and synthetic oil-- 3parts natural oil for every 5 parts of synthetic oil. How many liters of Petrolyn oil can be made from 400 liters of synthetic oil?