6.75 billion in scientific notation

What is the vertical asymptotes of the function f(x)=x-2/x*2-3x-4

Find the cosine function that is represented in the graph.

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed