Answer
Values of provided expressions are:
\[\begin{align}
& \text{Expression }79:\left( 2\times {{10}^{3}} \right)\left( 3\times {{10}^{2}} \right)=\underline{\text{600000}} \\
& \text{Expression }80:\left( 5\times {{10}^{8}} \right)\left( 2\times {{10}^{-4}} \right)=\underline{100000} \\
& \text{Expression }81:\left( 2\times {{10}^{9}} \right)\left( 3\times {{10}^{-5}} \right)=\underline{6000} \\
& \text{Expression }82:\left( 4\times {{10}^{8}} \right)\left( 2\times {{10}^{-4}} \right)=\underline{8000} \\
\end{align}\]
Work Step by Step
Try to solve the expressions with the help of TI-83 calculator:
Steps to solve the expression 79:
Step 1: Switch on the calculator.
Step 2: Enter the expression, for that press the following keys in sequence:
\[2,\text{ }2\text{nd}\left( \text{shift key} \right),\text{ EE},\text{ }3,\text{ }\times ,\text{ }3,\text{ }2\text{nd}\left( \text{shift key} \right),\text{ EE},\text{ }2\]
Step 3: Press ENTER key to get your answer.
Hence, the value of the given expression is: 600000.
Steps to solve the expression 80:
Step 1: Switch on the calculator.
Step 2: Enter the expression, for that press the following keys in sequence:
\[5,\text{ }2\text{nd}\left( \text{shift key} \right),\text{ EE},\text{ 8},\text{ }\times ,\text{ 2},\text{ }2\text{nd}\left( \text{shift key} \right),\text{ EE},\text{ }(-)\text{, 4}\]
Step 3: Press ENTER key to get your answer.
Hence, the value of the given expression is: 100000.
Steps to solve the expression 81:
Step 1: Switch on the calculator.
Step 2: Enter the expression, for that press the following keys in sequence:
\[2,\text{ }2\text{nd}\left( \text{shift key} \right),\text{ EE},\text{ 9},\text{ }\times ,\text{ }3,\text{ }2\text{nd}\left( \text{shift key} \right),\text{ EE},\text{ (}-\text{), 5}\]
Step 3: Press ENTER key to get your answer.
Hence, the value of the given expression is: 6000.
Steps to solve the expression 82:
Step 1: Switch on the calculator.
Step 2: Enter the expression, for that press the following keys in sequence:
\[4,\text{ }2\text{nd}\left( \text{shift key} \right),\text{ EE},\text{ 8},\text{ }\times ,\text{ 2},\text{ }2\text{nd}\left( \text{shift key} \right),\text{ EE},\text{ (}-\text{), 4}\]
Step 3: Press ENTER key to get your answer.
Hence, the value of the given expression is: 8000.
