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All interior angles in a quadrilateral add up to 360 degrees. Adding up what we know so far 60 + 75 + 105 = 240. So the fourth angle must be 360 - 240 which equals 120 degrees.

We start by noticing that both the numerator and denominator are expressions which can be factorised into brackets. Starting with the numerator, we multiply the coefficient of x^2 and the constant term to...

Bacteria resides virtually everywhere around (and within) us. In schools and university conditions, bacteria cultures are incubated at 25°C or lower to reduce the chances of growing harmful pathogens whic...

Write the 2 equations above each other: 3x-y=23 2x+3y=8First we want to remove the y terms to be able to find out x, so multiply the top equation by 3 9x-3y=69 2x+3y=8Now that we have -3y on the top and -...

cos(2x) - 2x*sin(2x)