exam Maths Puzzle Numerical Ability

there are 4 positions with 6 people to fill. How many different ways can the officers be elected?

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exam Other Question

if f(x)=3sinx + 2cos2x, the value of (Pie/2) is I need help please.

The function that relates weight in grams of a crystal (w) to the temperature t in degrees Fahrenheit in which it was grown is as follows (fictitious):
W(t) = 0.8t + 12

Find w(-6).