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3^2 + 4^2 = x^2. Find x

By Pythagoras’s theorem, a²+b²= c². So x²= 9+16=25 and so by finding the square root of 25, x=5

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Find and simplify the point(s) of intersection of the curves: x^2 + y^2 =6 , y = x - 3

Substituting y = x-3 into the first equation and expanding brackets:(x-3)²+x² = 6 <=> 2x² -6x +9 =6 <=> 2x² -6x +3 =0Solving by using the quadratic ...

Answered by Evans R. • Maths tutor

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Explain how blood vessels help to regulate a human's body temperature (3marks)

The blood vessels dilate and widen, which means that the blood flows closer to the surface of the skin, so more heat is able to be released, which cools the overall body temperature.

Answered by Bill C. • Biology tutor

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To what extent was the United States responsible for the collapse of the Grand Alliance at the end of the Second World War?

In writing this essay, the first thing to note is the structure of the question – ‘to what extent’ – this means that the essay will have to have two sides and deal both with the United States and the Sovi...

Answered by • History tutor

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Explain how a stack could be used in the process of evaluating an expression in Reverse Polish notation.

Starting at the left hand side of the expression push values onto stack. Each time operator reached in the expression pop the top two values off the stack and apply the operator to them, then push the new...

Answered by Ellie F. • Computing tutor

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