Earth's equator is about 24,902 mi long. What is the approximate surface area of Earth?
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If you start from the "standard" sine function, i.e.
You can change its graph in four ways:
Amplitude: you can multiply the whole function by a constant to stretch/squeeze it vertically. The transformation looks like
Phase: you can add a constant to the argument translate it horizontally. The transformation looks like
Period: you can multiply the argument by a constant to stretch/squeeze it horizontally. The transformation looks like
Shift: you can add a constant to the whole function to translate it vertically. The transformation looks like
In your case, we're changing the period of the function. If the function is squeezed, so you're squeezing the graph horizontally by a factor of 7/4