exam Maths Puzzle Numerical Ability

Determine the equation of the line that is perpendicular to the y=-1/5 x and passes through the point (1,9)

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This problem has been bothering me for a while now. I need help on how to solve it. It goes like this: If f(x)= 1-3x and g(x)= 1/ x^2 +1, find f(g(0)) and g(f(1)) An architect has designed a motel pool within a rectangular area that is fenced on three sides as shown in the figure. If she uses 60 yards of fencing to enclose an area of 352 sq