Suppose the correlation between height and weight for adults is +0.80. what proportion (or percent) of the variability in weight can be explained by the relationship with height?

Correlation is a mutual relationship or connection between two or more things. In our example a correlation of +0.80 between height and weight for adults means. A) 80%. The correlation measures the extent to which knowing the value of height helps you to predict the value of weight. Even with a high correlation of +0.80, we cannot really expect two persons with exactly the same height to have exactly the same weight. Almost always there is some difference.  What this says is that, as height goes higher, the weight goes higher, too. 

answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

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well, i believe that the answer is 2. : 3