$\"\"$

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The function $\"\"$ .

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Where $\"\"$ is the angle.

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$\"\"$

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(a)

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Find $\"\"$ when $\"\"$ .

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Consider $\"\"$ .

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Substitute the value $\"\"$ .

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$\"\"$

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$\"\"$ hr.

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Find how long is sally on the paved road.

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Consider $\"\"$ .

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Rewrite the function as $\"\"$

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$\"\"$ .

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Here,

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$\"\"$ represents how long is sally on the beach.

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$\"\"$ represents how long is sally on the paved road.

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Consider $\"\"$ .

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Substitute the value $\"\"$ .

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$\"\"$

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$\"\"$ hr.

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$\"\"$

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(b)

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Find $\"\"$ when $\"\"$ .

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Consider $\"\"$ .

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Substitute the value $\"\"$ .

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$\"\"$

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$\"\"$ hr.

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Find how long is sally on the paved road.

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Consider $\"\"$ .

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Substitute the value $\"\"$ .

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$\"\"$

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$\"\"$ hr.

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$\"\"$

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(c)

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Find $\"\"$ when $\"\"$ .

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Consider $\"\"$ .

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Substitute the value $\"\"$ .

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$\"\"$

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$\"\"$ hr.

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Find how long is sally on the paved road.

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Consider $\"\"$ .

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Substitute the value $\"\"$ .

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$\"\"$

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$\"\"$ hr.

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$\"\"$

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(d)

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Find $\"\"$ when $\"\"$ .

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Consider $\"\"$ .

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Substitute the value $\"\"$ .

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$\"\"$

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$\"\"$ hr.

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For $\"\"$ , Sally jogs 1 mile directly to the road, then 8 miles across, the 1 mile directly to the other house.

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But we can not use the function $\"\"$ , because $\"\"$ is undefined when $\"\"$ .

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$\"\"$

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(a)

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$\"\"$ hr, $\"\"$ hr.

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(b)

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$\"\"$ hr, $\"\"$ hr.

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(c)

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$\"\"$ hr, $\"\"$ hr.

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(d)

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$\"\"$ hr.

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Sally jogs 1 mile directly to the road, then 8 miles across, the 1 mile directly to the other house.

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We can not use the function $\"\"$ , because $\"\"$ is undefined when $\"\"$ .