(i) Probability of getting two heads = 0.5*0.5 = 0.25 (Here we multiply the probability of getting a head by the probability of getting a head)
(ii) Probability of getting at least one head = 0.5*0.5 + 0.5*0.5 + 0.5*0.5 = 0.75 (Here we add the probability of getting a head and a head to the probability of getting a head and then a tail and then add the probability of getting a tail and then a head) The second way to do this is to subtract the probability of not getting any heads (ie. getting a tail and a tail) from 1: 1 - 0.5*0.5 = 1 - 0.25 = 0.75
<h2><em>y = ± 5⁄2 x</em></h2><h2><em>y = ± 5⁄2 xThe equation is the left half of the hyperbola. The domain is ( – ∞, – 1⁄5 ]. The range is ( – ∞, ∞ ). The vertical line test indicates that this is not the graph of a function.</em></h2>
