(1) Some sources say an average American will eat over \( 6 \times 10^{4} \) pounds of food in his or her lifetime. That means that a family of 5 will eat over \( 3 \times 10^{5} \) pounds of food in all. That's equal to the weight of more than 30 elephants. A. Write \( 3 \times 10^{5} \) in standardmotation. \( 3 \times 10^{5} \) \( =? 2 \)

3. จำนวนนับข้อใดที่มี 7 เป็นตัวประกอบทั้งหมด ก. \( 14,21,35 \) ข. \( 15,28,42 \) ก. \( 21,29,35 \) ง. \( 28,42,50 \)

At the Throw Factory, the assembly line produces 122 baseballs in a batch. The baseballs are packaged in boxes with 11 each. If 8 batches are made in one day, how many baseballs will be leftover at the end of it?

(4) The width of a human hair is about \( 1 \times 10^{-4} \) meter wide The width of mechanical pencil lead is about \( 7 \times 10^{-4} \) meter wide. 4. About how mony piceses of hair would in toke to motch the width of a piece of mechanical pencil lead?

(40) At the Medal Factory, the assembly line produces 98 screwdrivers in a batch. The screwdrivers are packaged in boxes with 12 each. If 5 batches are made in one day, how many screwdrivers will be leftover at the end of it?

Simplify. Your answer should contain only positive exponents. \( \frac{3 m^{-1}}{2 m^{2}} \) \( \frac{s}{2 m^{3}} \) \( \frac{m}{3} \) \( m^{4} \) \( \frac{1}{4 m^{2}} \)