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Paraphin [41]
3 years ago
11

Pls help due soon ..........

Mathematics
1 answer:
GrogVix [38]3 years ago
8 0

Answer:

8.5

Step-by-step explanation:

So substitute the vales for r and d

(4*2)

and |-6| means the absolute value of -6, which is just 6

so simplifying the equation would make it

(8+6.5) - 6

14.5-6

8.5 :)

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What is the exact value of cos (67.5° )?
Brilliant_brown [7]

Answer:

0.38268343

Step-by-step explanation:

cos( 67.5 )

Rewrite  

67.5

as an angle where the values of the six trigonometric functions are known divided by  2 . cos ( 135\ 2)

Apply the cosine half-angle identity.

±

√

1

+

cos

(

135

)

2

 

Change the  

±

to  

+

because cosine is positive in the first quadrant.

√

1

+

cos

(

135

)

2

Simplify  

√

1

+

cos

(

135

)

2

√

2

−

√

2

2

The result can be shown in multiple forms.

Exact Form:

√

2

−

√

2

2

Decimal Form:

0.38268343

…

6 0
3 years ago
Analyze the diagram below and complete the instructions that follow. Find a, b, and c.
ahrayia [7]

Answer:

<u>The correct answer is the letter C. </u>

Step-by-step explanation:

We can use the following trigonometric identity:

cos(60)=\frac{6}{b} (1)

cos(45)=\frac{c}{b} (2)

Solving each equation by b and equaling we have:

\frac{6}{cos(60)}=\frac{c}{cos(45)}

\frac{6}{cos(60)}=\frac{c}{cos(45)}

Let's recall that:

cos(45)=\frac{1}{\sqrt{2}}

cos(60)=\frac{1}{2}

Then we have:

c=\frac{cos(45)*6}{cos(60)}

c=\frac{2*6}{\sqrt{2}}

c=\frac{12}{\sqrt{2}}

c=6\sqrt{2}

Using equation (1) we can find b.

cos(60)=\frac{6}{b}  

b=12      

Finally, we can find a using the next equation:

tan(60)=\frac{a}{6}

a=6*tan(60)

a=6\sqrt{3}

<u>Therefore, the correct answer is the letter C. </u>

I hope it helps you!

5 0
3 years ago
HELP!<br> <img src="https://tex.z-dn.net/?f=%5Csqrt%7Bx-1%7D-x%3D-7" id="TexFormula1" title="\sqrt{x-1}-x=-7" alt="\sqrt{x-1}-x=
katen-ka-za [31]

\huge \huge \huge\huge\mathrm{ \boxed{ \boxed{ \boxed{ \boxed{ \boxed {\boxed{  \huge\mathfrak{ Solution}}}}}}}}

  • \sqrt{x - 1}   - x =  - 7

  • \sqrt{x - 1}  =x  - 7

  • x - 1 = (x - 7) {}^{2}

  • x - 1 =  {x}^{2}  + 49 - 14x

  • {x}^{2}  - 14x + 49 - x + 1 = 0

  • {x}^{2}  - 15x + 50 = 0

  • {x}^{2}  - 10x - 5x + 50 = 0

  • x(x - 10) - 5(x - 10) = 0

  • (x - 5)(x - 10) = 0

  • x = 5 \:  \:  \: or \:  \:  \: x = 10

6 0
3 years ago
Read 2 more answers
Suppose that the mean of your 50 rolls is x = 3.25. Are you suspicious about the fairness of the die? Justify your answer.
Romashka-Z-Leto [24]

Answer:

3.25x50=21

Step-by-step explanation:

6 0
3 years ago
A survey of nonprofit organizations showed that online fundraising has increased in the past year. You want to estimate the popu
kakasveta [241]

Answer:

e. a point estimate

Step-by-step explanation:

When an estimate for the unknown population parameter is expressed by a single value it is called a point estimate.

Example : If we wish to find the height of a very large group of students on the basis of a sample and we find it to be 64 inches. 64 inches is the point estimate.

<em>Similarly the value given is the point estimate.</em>

Point estimate of the population parameter provides as an estimate a single value calculated from the sample that is likely to be close in value to the unknown parameter. It is to be noted that a point estimate will not in general be equal to the population parameter as the random sample used is one of the many possible samples which could be chosen from the population.

6 0
3 years ago
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