14/20=0.7 or 70% are soft-centred. If we take two candies we have three possibilities associated with probabilities:
Both soft-centred: 0.7²=0.49 or 49%
Both hard-centred: 0.3²=0.09 or 9%
One of each: 2×0.3×0.7=0.42 or 42%. 49+9+42=100%. So these are all the possible outcomes.
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The period of a sinusoid
is
, so any range such that
will give two complete periods.
So area is base x height:
5(x+2)=20
5x+10=20
5x=10
x=2
its A
