The population of the state of California was about \( 37,250,000 \) people in 2013 . Which number best approximates the population as a single digit times a power of 10 ?

Find \( \sum_{i=3}^{7}\left(3\left(\frac{1}{2}\right)^{i-1}\right) \) First write out the summation: Find the answer:

For the sequence defined by: \( a_{1}=4 \) \( a_{n+1}=\frac{2}{a_{n}}-2 \) Find: \( a_{2}=\square \) \( a_{3}=\square \) \( a_{4}=\square \)

Given the geometric sequence: \( 32, \frac{256}{9}, \frac{2048}{81}, \ldots \) Find an explicit formula for \( a_{n}: \) \( a_{n}=\square \) Find \( a_{13}: \square \)

Write in interval notation. \( \{x \mid-4 \leq x<-1\} \) A. \( (-4,-1] \) B. \( (-4,-1) \) C. \( [-4,-1] \) D. \( [-4,-1) \)

Find the common ratio and write out the first four terms of the geometric sequence \( \frac{4^{n+1}}{5} \) Common ratio is \( a_{1}=\square, a_{2}=\square, a_{4}=\square \)