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When a beta decay occurs there are a couple of things you need to remember. First of all you are right, the nucleus doesn't contain any electrons. It does however contain neutrons and protons. We know tha...

This is a simple quadratic equation. To answer the question, it must first be factorised before it can be solved. To do this, two numbers need to be found which multiply to make the constant term and have...

x=4t-7 take the -7 over first, swapping the sign as it passes over the equals sign x+7=4t 4t = 4*t so we need to divide the other side of the equation by 4 1/4(x+7)=t

Factorise: X^2 means 2 brackets (x )(x )=0 factors of 1 = 1 (x 1)(x 1)=0 to get minus 2 you must do (-1) + (-1) so (x-1)(x-1)=0 therefore x-1=0 and x=1

The "passé simple" is most often used in literary and formal writing express a completed past action. E.g. Un jour, elle tomba malade. (one day, she fell ill)

The "imparfait" on...