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2 years ago

Can someone plzzzzzzzzzzzzzzzzzzzzzzzz help me

Mathematics

1 answer:

Marat540 [252]2 years ago

6 0

9514 1404 393

Answer:

C. 168°

Step-by-step explanation:

The exterior angle at any vertex of an n-gon will be ...

360°/n

So a 30-gon will have exterior angles of ...

360°/30 = 12°

The adjacent interior angle is supplementary to this, so is ...

180° -12° = 168°

_____

<em>Using the reasonableness test</em>

You know that the interior angles of a square are 90°, and that regular polygons with more sides have larger interior angles. The most any regular polygon's interior angle can be is 180°. The only answer choice between 90° and 180° is the correct choice: 168°.

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Step-by-step explanation:

Amount of substance:

The amount of substance after t years is given by an equation in the following format:

$A(t) = A(0)(1-r)^t$

In which A(0) is the initial amount and r is the decay rate, as a decimal.

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This means that:

$A(5.3) = 0.5A(0)$

We use this to find r. So

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We have that $A(26.5) = 14.5$ , and use this to find A(0). So