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If 168 is four sevenths of a number then divide this by 4 to give 1 seventh of the number.
168/4 = 42
So 42 is one seventh of the number.
Now multiply this by 7 to find the number.
42*...

When finding the gradient of a line we need to first locate any two points, on the line, where we know the x-coordinates and we know the y-coordinates. Now, with these two coordinates we need to find two ...

f^-1(x) is equivalent to the inverse of the function f(x). To solve the inverse of a function, a series of steps must be followed:
1) Write out the equation x = f(y)
T...

x²+y²=25; y-3x=13; x²+(13+3x)²=25; x²+9x²+78x+169=25; 10x²+78x+144=0; 5x²+39x+72=0; (5x+24)(x+3)=0; x=-24/5 and y=-7...