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icang [17]
3 years ago
14

PLEASE HELP!!! WILL GIVE BRAINLEST AWARD FOR MOST DESCRIPTIVE

Mathematics
1 answer:
Rashid [163]3 years ago
3 0
The law of cosines states that:

c^2=a^2+b^2-2abcosC

You already have all the values for the variables with the exception of x so:

x^2=25+100-100cos60

x=√(125-100cos60)

x=√75

x≈8.66 to nearest one-hundredth...
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ANSWER IT!!! I ONLY HAVE MINUTES ​
Sergeeva-Olga [200]

Answer:

D

Step-by-step explanation:

5 + n is the sum of 5 and a number

amd then "less than or equal to -7" represents the no more than -7

8 0
3 years ago
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Find the slope (-7, 3) and (4, -2)<br>​
Lina20 [59]
The formula for slope is (x2-x1)/(y2-y1).

we label the points accordingly:
(-7,3) as (x1, y1)
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(-2-3)/(4-(-7))

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4 years ago
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Please show step by step of working out the value of r for which is A is aminimum and calculate the minimum surface area of the
almond37 [142]

Answer:

The minimum surface area of the container is 276.791 square units.

Step-by-step explanation:

Let be A(r) = \pi\cdot r^{2} + \frac{1000}{r}, \forall \,r \in \mathbb{R}, r \geq 0. The first and second derivatives of such function are, respectively:

First derivative

A'(r) = 2\cdot \pi \cdot r -\frac{1000}{r^{2}}

Second derivative

A''(r) = 2\cdot \pi +\frac{2000}{r^{3}}

The critical values of r are determined by equalizing first derivative to zero and solving it: (First Derivative Test)

2\cdot \pi \cdot r -\frac{1000}{r^{2}} = 0

2\cdot \pi \cdot  r^{3} - 1000 = 0

r = \sqrt[3]{\frac{1000}{2\pi} }

r \approx 5.419 (since radius is a positive variable)

To determine if critical value leads to an absolute minimum, this input must be checked in the second derivative expression: (r \approx 5.419)

A''(5.419) = 2 + \frac{2000}{5.419^{3}}

A''(5.419) = 14.568

The critical value leads to an absolute minimum, since value of the second derivative is positive.

Finally, the minimum surface area of the container is:

A(5.419) = \pi\cdot (5.419)^{2} + \frac{1000}{5.419}

A(5.419) \approx 276.791

The minimum surface area of the container is 276.791 square units.

7 0
3 years ago
What does 2x+5=3x-2 equal
iren2701 [21]

Answer:

x = 7

Step-by-step explanation:

4 0
3 years ago
Every​ morning, my neighbor goes out walking. I observe that​ 20% of the time she walks with her​ beagle, 70% of the time she wa
Oduvanchick [21]

Answer:

No, This is not a valid Probability Distribution

Step-by-step explanation:

Probability [Neighbour walks with Beagle] = 20%

Probability [Neighbour walks with Golden Retriever] = 70%

Probability [Neighbour walks alone] = 30%

Disjoint Events are the events that have zero probability of occurring together. If all the three above items are disjoint, it means that it can never happen that two of them happen together.

The total (summed) probability of a valid probability distribution, with disjoint sets = 1 . In given case, total probability = 0.2 + 0.7 + 0.3 = 1.2 ; i.e > 1.

So, this probability distribution with stated disjoint events is not a Valid Probability distribution.

5 0
3 years ago
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