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4 years ago

Please help will give BRAINLIEST

Mathematics

1 answer:

Nastasia [14]4 years ago

7 0

Answer:

I think it is C. 14

Step-by-step explanation:

r+3+4r-28=45

5r-25=45

5r=70

r=14

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What differentiable functions have an arc length on the interval [a, b] given by the following integrals? Note that the answers

Dafna1 [17]

Answer:

a) $\pm 8\frac{x^{5}}{5}+C$

b) $\pm 4 sin(2x) + C$

Step-by-step explanation:

Given integrals are:

$a) \int\limits^a_b {\sqrt{{1+64x^{8}} } \, dx$ ---(1)

$b) \int\limits^a_b {\sqrt{1+64cos^{2}(2x)} } \, dx$ ---- (2)

Standard form

$L= \int\limits^a_b {\sqrt{1+(f'(x))^{2}} } \, dx$

compare (1) with standard form

$[f'(x)]^{2} = 64x^{8}\\f'(x)=\pm 8x^{4}\\f(x)= \pm8\frac{x^{5}}{5}+C$

Compare (2) with standard form

$[f'(x)]^{2}=64cos^{2}(2x)\\f'(x)= \pm 8cos(2x)\\f(x)=\pm 8\frac{sin(2x)}{2}+C\\f(x)= \pm 4sin(2x)+C$

5 0

3 years ago

Turtles can live a long time. This stem-and-leaf plot shows the ages (in years) of the turtles in the reptile house of the Kalam

madreJ [45]

Answer:

1,1,2,5,6,7,10,10,13, 18, 19, 20, 24, 26, 27, 31, 36, 54, 63, 67

The average age is 22 yrs

The sum of the ages is 440 yrs

When two of the turtles leave, the average is 21 yrs....and there are 18 turtles left

So....the sum of the ages is 21 * 18 = 378

And the difference in the sums is 62

The only two values that sum to 62 are 26 and 36

So.....the box turtle must have been 36 and the map turtle must have been 26

Step-by-step explanation:

3 0

3 years ago

Bernice takes a multiple-choice test, each question having 4 choices. If Bernice has no idea of any answer and simply guesses, f

hoa [83]

We want to find the probability that Berenice gets all the answers correct.

<u>1 question:</u>

Each question has 4 options, each option has the same probability of being the correct option, so she has a 25% of<u> randomly selecting the correct option.</u>

Then the probability here will just be equal to the number of correct options (1) over the total number of options (4)

p = 1/4

2 questions:

We already know the probability for one question, then the probability of getting two questions correct will be equal to the <u>product of the individual probabilities</u> for each question:

p = (1/4)*(1/4 = 1/16

3 questions:

Similar approach as before:

p = (1/4)*(1/4)*(1/4) = 1/64

4 questions:

p = (1/4)*(1/4)*(1/4)*(1/4) = 1/256

If you want to learn more, you can read:

brainly.com/question/23044118

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3 years ago

Im having trouble on my math hw mind helping me out ?<br>16+a<4?

Margarita [4]

Answer:

a < -12

Step-by-step explanation:

Move all terms not containing

to the right side of the inequality.

a < − 12

<3 Hope this helped

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3 years ago

What is 51 divided by 25

Vesnalui [34]

2 1/25 is the answer

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4 years ago

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