The diameter of a circle is 8 m.find the circumference to the nearest tenth

Mathematics

1 answer:

Diano4ka-milaya [45]2 years ago

8 0

Answer:

50.3

Step-by-step explanation:

The formula for the circumference of a circle is Area = pi * radius squared. So if the diameter is 8, then the radius is half of that, so it's 4. Now we square 4 and we get 16. Then multiply that by pi so we get 16 * pi = 50.26548. The tenth is the first # behind the decimal point, so your answer is 50.3. I hope this helped! :)

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An element with mass 800 grams decays by 8.2% per day. How much of the element is remaining after 15 days,

Serjik [45]

Given:

The initial mass of an element is 800 grams.

Decay rate = 8.2% per day

Number of days = 15

To find:

The remaining element after 15 days.

Solution:

The exponential decay model is

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2 years ago

Factor the algebraic expression below in terms of a single trigonometric function. sin 2x + sin x - 2

Pie

Answer:

The factored form is (sin x +2)(sin x-1)

Step-by-step explanation:

We have been given the trigonometric function $\sin^2 x +\sinx-2$

We can factor this by AC method. In AC method we multiply the term a and c and then write the middle term b in such a way that the sum/difference is equal to the product 'ac'

Using the method, we can write sinx as 2sinx -sinx

$\sin^2 x +2\sinx-\sin x-2$