Social networker 177 316 493 Not a social networker 83 310 393 Total 260 626 886 Let S the event the Internet-using teen is a social networker, N the event the Internet-using teen is not a social networker, T. the event the Internet-using teen sends text messages to friends every day, and the event the Internet-using teen does not send text messages to friends every day. Consider this experiment: An Internet-using teenager is randomly selected and surveyed. The teen is categorized as a social networker or not a social networker and as someone who sends text messages to friends every day or someone who does not. The probability that the randomly selected Internet-using teenager sends text messages to friends every day is The probability that the randomly selected Internet-using teenager is a non- social networker who sends text messages to friends every day is The probability that the randomly selected Internet-using teenager sends text messages to friends every day given that he or she is a non- social networker is Are events T and N independent? O Yes O No

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Unitary Method

The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products. 

Speed, Time, and Distance

Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.

Profit and Loss

The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.

Units and Measurements

Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.