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(2x+9)² = (2x+9)(2x+9) Use FOIL to expand these brackets: First - (2x+9)(2x+9) --> 4x² Outside - (2x+9)(2x+9) --> 4x² + 18x Inside - (2x<...

The first law of thermodynamics states that energy can neither be created nor destroyed. Energy has to be used when breaking bonds, yet is formed when making bonds. This means that there will be an overal...

Despite animal cells all having a nucleus (for genetic information storage and reproduction), a cytoplasm (for structure), mitochondria (for aerobic respiration), ribosomes (for protein synthesis) and a c...

Firstly we need to get all the x's on one side and the numbers on the other side. So if we add 2 to both sides we get 5x > 3x + 13. Now as we want the x's on the right hand side, we need to subtract bo...

A mutation arises in an individual that confers a selective advantage.  The phenotype the mutation produces is selected for by natural selection and so the individual survives to reproductive age.  This m...