exam Maths Puzzle Numerical Ability

If x is an odd whole number, which of the following also represents an odd number?

a. 2x+1
b. x-2
c. 4x-3
d. all of the above

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exam Other Question

(-1,-5),m=-7 The volume of the box is represented by (x^2 + 5x + 6)(x + 5). Find the polynomial that represents the area of the bottom of the box.

I am having a hard time with this and need some help. Thanks.