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Len [333]
3 years ago
15

What is 81 rounded to the nearest ten?

Mathematics
2 answers:
babunello [35]3 years ago
8 0

Answer:

80

Step-by-step explanation:

tekilochka [14]3 years ago
4 0

Answer:

80

Step-by-step explanation:

Think of it like a hill

Anything 5 and under goes to 0

Anything above 5 influences the next number

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How to use inverse cosin
Alecsey [184]

Answer:

sec

Step-by-step explanation:

1/cosin = sec or cosin^-1

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3 years ago
Read 2 more answers
A pyramid has a regular hexagonal base with side lengths of 4 and a slant height of 6. Find the total area of the pyramid.
Tanzania [10]

The total area of pyramid is 113.569 square units

The equation to find the total area of the pyramid is Total area = base area + lateral area.

<u>Solution:</u>

Given, A pyramid has a regular hexagonal base with side lengths of 4 and a slant height of 6.

<em><u>The total area of pyramid is given by:</u></em>

A=A_{b}+A_{l}   ---- eqn 1

Where,

A_{b} \text { is the base area and } A_{l} \text { is the lateral area }

<em><u>The area of base is given as:</u></em>

A_{b}=\frac{3 \sqrt{3}}{2} l^{2}

Where "l" is the side of hexagon.

Substituting we get,

\begin{array}{l}{A_{b}=\frac{3 \sqrt{3}}{2}(4)^{2}} \\\\ {=\frac{3 \sqrt{3}}{2} \times 16=3 \sqrt{3} \times 8} \\\\ {A_{b}=24 \sqrt{3}}\end{array}

<em><u>The lateral area is given as:</u></em>

A_{l}=3 b h

Where,

b: base of the triangle

h: height of the triangle

Substituting we get,

\begin{array}{l}{A_{l}=3 \times(4) \times(6)} \\\\ {A_{l}=72}\end{array}

Plugging in the values we found in eqn 1 we get,

A=24 \sqrt{3}+72

A = 113.569 square units

<em><u>Summarizing the results:</u></em>

The total area of pyramid is 113.569 square units approximately

The equation used to find total area of pyramid is Total area = base area + lateral area.

8 0
3 years ago
Determine whether the following is a probability distribution. If not, identify
shutvik [7]

Due to a negative value of P(X = x), it is found that the following is not a probability distribution.

---------------------

A sequence (x, P(X = x)) is a probability distribution if:

  • The sum of all values of P(X = x) equals 1.
  • There is no negative values of P(X = x).

In this problem, P(X = 2) is negative, thus, it is not a probability distribution.

A similar problem is given at brainly.com/question/24224213

4 0
3 years ago
The measure of angle θ is . The measure of its reference angle is _°, and tan θ is _?
defon

Answer:

0000

Step-by-step explanation:

5 0
3 years ago
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