exam Maths Puzzle Numerical Ability

Events W,X,Y and Z are independent, and P(W)= 0.75, P(X)= 0.25, P(Y)= 0.2, and P(Z)= 0.3. Find P(W and X).

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exam Other Question

Simplify:

square root of 15x^6 * the square root of 16x^5

I got the answer 4x^5 square root of 15x. Is this correct? Thanks so much!! In a circle whose radius is 15 inches, a chord is 12 inches from the center, what is the length of the chord