One way is shown here: https://www.desmos.com/calculator/76qirhx3nh
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A step function is defined various ways. One way has [[0]] = 1/2. That is what is shown on the graph at the above link. Choose the definition that matches your text.
The horizontal scale factor of 3 (in 3x) does nothing. When x > 0, 3x > 0; when x < 0, 3x < 0. The +3 adds a vertical offset to the graph of [[x]].
Hi there!
So first we should find what 1% of 575 is. To do that de divide it by 1 and get 5.75. Since he gets 5.5 simple interest per year, we multiply 5.75 by 5.5. We get 31.625. This asks how much after 2 1/2 years, so lets multiply 31.625 by 2.5 and get 79.0625. Then add that amount to 575 and end out with 654.0625. But this question asks us to round to the nearest cent, and after rounding we have 654.06. So, after 2 1/2. years he has $654.06! Hope this helps.
8:2
Or you could also say these
8 to 2
8/2
The geometric sequence is multiplied by 4
