What’s the correct answer for this question?

What is the number 321,000,000 in scientific notation? also what is the number? ?

Graph g(x)=2cosx . use 3.14 for π . use the sine tool to graph the function. graph the function by plotting two points. the first point must be on the midline and closest to the origin. the second point must be a maximum or minimum value on the graph closest to the first point.

What is the order of these fractions from least to greatest 2/3 7/10 5/8 65/100