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Mamont248 [21]
3 years ago
13

I need help on this also could I get an explanation on how you solved it? Please don't take my points ill get u banned. :P

Mathematics
2 answers:
mestny [16]3 years ago
7 0
1/16
Hope this helps, have a good day
^^
kenny6666 [7]3 years ago
6 0

Answer:

1/2

Step-by-step explanation:

4 is the total right and 5/7 make it half so it will be 1/2. hope this helps!

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Let t = cosA + sinA<br> find values of t if <br> 2 - sin2A = 2(cosA + sinA)
Zinaida [17]

2 - \sin(2A) = 2(\cos A + \sin A)\\\\2-2\sin A\cos A=2\cos A+2\sin A\\\\2\sin A\cos A+2\cos A+2\sin A-2=0\\\\1+2\sin A\cos A+2\cos A+2\sin A-3=0\\\\\sin^2 A+\cos^2 A+2\sin A\cos A+2\cos A+2\sin A-3=0\\\\(\sin A+\cos A)^2+2\cos A+2\sin A-3=0\\\\(\sin A+\cos A)^2+2(\cos A+\sin A)-3=0\\\\\\t^2+2t-3=0\\\\t^2+2t+1-4=0\\\\(t+1)^2=4\\\\t+1=2\qquad\vee \qquad t+1=-2\\\\\\\boxed{t=1\qquad\vee\qquad t=-3}

When A\in\mathbb{R}

t=\cos A+\sin A\in[-\sqrt{2};\sqrt{2}]\approx[-1.4142;1.4142]

and there is only one answer t = 1.

For A\in\mathbb{C} both values are correct.

4 0
4 years ago
How do i solve this?
AleksAgata [21]
This is what you do.

(3)^(-9+7)= (3)^(-2)

= (1/3)^2

=1/9
4 0
3 years ago
Consider the following: A medical researcher wants to determine the effects of pH (a measure of alkalinity or acidity, with pure
natita [175]

Answer:

See below

Step-by-step explanation:

<h3>Continuation of the question</h3>

<u>Data in the table:</u>

<u>PH             4       5     6     7     8    9     10     11 </u>

<u>Bacteria    116   120  131  136  141  151  148   163</u>

  • <em>Create a scatter plot to represent the data: Based on the data and your scatter plot, what do you think a good linear function would be to represent the data?</em>
<h3>Solution</h3>

<em>See attached for scatter plot</em>

We can see the chart is close to linear function. Let's build one based on data in the table

<u>The line will be in the form of:</u>

  • y = mx + b

<u>If we use two points and get the equation</u>

  • (4, 116) and (8, 141)

<u>Finding the slope:</u>

  • m = (141-116)/(8-4) = 25/4 = 6.25

<u>Then, finding y-intercept:</u>

  • 116 = 6.25*4 + b
  • b = 116 - 25 = 91

<u>So the line is:</u>

  • y = 6.25x + 91

<em>Note: This is approximate best fit graph and it is attached as well. Exact formula for the line is built by using different method and is very close to the one above</em>

4 0
4 years ago
Is it OK to answer a question with website information?<br> (for school)
dangina [55]

Answer:

Yes as long as it's not plagerized

Step-by-step explanation:

You can give credit to the website you got it from by leaving the link, writing down the website, or do this, "Thank you, Next"- Ariana Grande

6 0
3 years ago
A six controller thumb covers costs $2.10. At this rate, how much should 32 thumb covers cost? round to the
Misha Larkins [42]

Answer:

67 dollars and 20 cents

Step-by-step explanation:

2.10 per thumb cover

32x2.10=67.2

5 0
3 years ago
Read 2 more answers
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