book Maths Puzzle Numerical Ability

The distance from the center of a compact disc to the edge of the disc is 6 centimeters. What is the area of the compact disc?
a) 36 square centimeters
b) 18.84 square centimeter

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book Other Question

I am very confused on finding the missing number. Finding x. Here is the question -2m=16m-9 here is what i have tried -18m=-9 m=1/2. Can you help? In which of the following is y a function of x

a. 3y+2x-9=0
b. x+y^2=5
c. x^2+y^2=25
d. noone of these