exam Maths Puzzle Numerical Ability

find the area of a rectangle which shows the answer as a polynomial in descending powers of x. length: 3x+9, width: x-1

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exam Other Question

f(x)=(e^x+e^-x)divided by 2. or f(x)=(e^x+e^-x)/2. There is a graph below the equation that you have to fill in. the X is filled in for u. you have to find
f(x)... im stuck on What is the radius of the circle 2x^2+2y^2-8x+16y-32=0? I think the am=nswer is 6?????