Question

1. in one week, the stock market posted $4.2 \cdot 10^7$ trades. the next week, it posted $6.8 \cdot 10^7$ trades. how many trades were made on the stock market during this 2 - week period? \

\
\
110,000 trades \
46,000 trades \
110,000,000 trades \
46,000,000 trades

Explanation:

Step1: Add the two numbers in scientific notation

To find the total number of trades in two weeks, we add the number of trades in each week. The number of trades in the first week is \(4.2 \times 10^{7}\) and in the second week is \(6.8 \times 10^{7}\). When adding numbers in scientific notation with the same exponent, we add the coefficients: \((4.2 + 6.8)\times10^{7}\)

Step2: Calculate the sum of the coefficients

First, calculate \(4.2+6.8 = 11\). So now we have \(11\times10^{7}\)

Step3: Convert to standard form

We know that \(10^{7}=10000000\), so \(11\times10^{7}=11\times10000000 = 110000000\)

Answer:

110,000,000 trades (which corresponds to the option "110,000,000 trades")