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The verbs ser and estar both translate as 'to be'. Its important to learn the differences between them. Ser is used to talk about permanent attributes. A useful tool to remember exactly when we need to use s...

Key points:Define proportional voting system: A voting system whereby representatives are elected in proportion to the share of votes they received.Examples: Single Transferable Vote, Alternative Vote, Mixed...

completing the square (x+5) 2 -25 -3 =0 (x+5) 2 -28 = 0 (x+5) 2 = 28 x= ±2√7 -5

Capillaries have walls only one endothelial cell thick, meaning their walls are very thin. This makes them well adapted for gas exchange, as substances only have to diffuse over a short distance. Additionall...

The easiest way to approach this is by trying to find two numbers which add up to the x coefficient (the number attached before the x) and multiply to the constant (the number on its own). For example...x 2 ...