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To satisfy the condition of substracting two fractions with unlike denominators, a common denominator needs to be found. By recognizing x^2 - 9 = (x-3)(x+3), we can rewrite the question as 4x/(x-3)(x+3) -...

Start with the left hand side (LHS) of the equation. r^2(r + 1)^2 - r^2(r - 1)^2Take the equivalent terms from the separate parts of the LHS outside of set of brackets.r^2[(r + 1)^2 - (r - 1)^2]Expand t...

A perfect 16 marker would be structured like this:

1. A small introductory paragraph
Perhaps including the definition of the key word put forward in the question a...

First draw a rough diagram of what the question describes. The student must work backwards. To answer, they must know the height of the projectile at the wall. To know the height of the projectile, they n...

Helicase (an enzyme) breaks the hydrogen bonds between the DNA resulting in two strands. Only one strand acts as a template. RNA nucleotides attracted to exposed bases according to base pairing rules (A-U...