18)

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The population of a town is $\"\"$ in $\"\"$

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The population increases at a rate of $\"\"$ every year.

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Hence, $\"\"$

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Find what will be the population of town in $\"\"$

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Compound interest formula

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$\"\"$

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Consider $\"\"$

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$\"\"$

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Since, $\"\"$ the population of town in $\"\"$

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19)

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Invest money in account $\"\"$

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Annual interest rate of $\"\"$

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Hence, $\"\"$

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Find how much money will be in account the after 7 years.

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Continuous compound interest formula

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$\"\"$

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Consider $\"\"$

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$\"\"$

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After 7 years money in account $\"\"$

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21)

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The parent function of the graph of $\"\"$

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Graph the function $\"\"$

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$\"\"$

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Observe the graph,

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The graph is stretched by factor of 3 units.

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The graph the function is $\"\"$