There are 140 people in a singing competition. The graph shows the results for the first five rounds. Write an expression for the number of people after x
rounds.
140-15x
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To write an expression for the number of people after x rounds, we need to observe the pattern in the given graph.
Looking at the graph, we can see that the number of people decreases by half in each round. So, after each round, the number of remaining people will be half of the previous round.
Starting with 140 people in the first round, the expression to represent the number of people after x rounds can be expressed as:
Number of people after x rounds = 140 * (1/2)^x
In this expression, (1/2)^x represents the factor by which the number of people decreases after each round, and 140 represents the initial number of people in the first round.