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Natali [406]
3 years ago
13

Tom wants to reach a second floor window on a house that is 20 feet above ground. If he must put the ladder at a 70° angle to th

e ground, how long must the ladder be?
Mathematics
1 answer:
vovangra [49]3 years ago
5 0
Let the ladder length be L, then

sin 70 = 20/L, L = 20/sin70 = 21.3 feet
the length of ladder is 21.3 feet
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Answer:

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Step-by-step explanation:

To write an equation that is perpendicular to a given line, take the negative reciprocal of the given slope. the given slope is 4/3, so the negative reciprocal is -3/4.

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3 years ago
What expression is equivalent to 3-(-2+5)
maxonik [38]

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Ok ok, I see. So the answer is -9.

Step-by-step explanation:

We know the expresion is:

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We need to distrubute the -3 to what is in the parthese.

When I say distribute, basically you need to multiply the numbers inside the parethese by -3. So we can think of it as:

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and:

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Which we can rewrite as:

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Sorry hope this helps!

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