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2 years ago

Does anyone know when the tutors for brainly is coming back ?

Mathematics

1 answer:

Sever21 [200]2 years ago

7 0

Answer:

Tutoring

Brainl.y may make available to Registered Users a service consisting of a live, online conn.ection with an authorized tutor (“Brainl.y Tutor”) using text c.hat via the Brainl.y Services interface (collectively, “Tutoring Services”). The Tutoring Services (and all content provided therewith) are deemed part of the Brainl.y Services hereunder.

The ability to connect with a Brai.nly Tutor shall be shown on a separate field or button, next to a given Question. After the connection with a Brain.ly Tutor is established, you may post questions to the Brain.ly Tutor using the Tutoring Services text-based interface in order for the Brain.ly Tutor to assist you by providing Answers or solutions to your Questions.

Step-by-step explanation:

Straight From Brai.nly

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Find the numbers b such that the average value of f(x) = 7 + 10x − 9x2 on the interval [0, b] is equal to 8.

barxatty [35]

Answer:

The numbers $b$ such that the average value of $f(x) = 7 +10\cdot x - 9\cdot x^{2}$ on the interval [0, b] is equal to 8 are $b_{1} \approx 1.434$ and $b_{2} \approx 0.232$ .

Step-by-step explanation:

The mean value of function within a given interval is given by the following integral:

$\bar f = \frac{1}{b-a}\cdot \int\limits^b_a {f(x)} \, dx$

If $f(x) = 7 +10\cdot x - 9\cdot x^{2}$ , $a = 0$ , $b = b$ and $\bar f = 8$ , then:

$\frac{1}{b}\cdot \int\limits^b_0 {7+10\cdot x -9\cdot x^{2}} \, dx = 8$

$\frac{7}{b}\int\limits^b_0 \, dx + \frac{10}{b} \int\limits^b_0 {x}\, dx - \frac{9}{b} \int\limits^b_0 {x^{2}}\, dx = 8$

$\left(\frac{7}{b} \right)\cdot b + \left(\frac{10}{b} \right)\cdot \left(\frac{b^{2}}{2} \right)-\left(\frac{9}{b} \right)\cdot \left(\frac{b^{3}}{3} \right) = 8$

$7 + 5\cdot b - 3\cdot b^{2} = 8$

$3\cdot b^{2}-5\cdot b +1 = 0$

The roots of this polynomial are determined by the Quadratic Formula:

$b_{1} \approx 1.434$ and $b_{2} \approx 0.232$ .

The numbers $b$ such that the average value of $f(x) = 7 +10\cdot x - 9\cdot x^{2}$ on the interval [0, b] is equal to 8 are $b_{1} \approx 1.434$ and $b_{2} \approx 0.232$ .

7 0

3 years ago

You have a hat with 5 gray, 3 red, 5 white, and 2 green marbles in it. Find the probability of picking a marble, replacing it, a

nordsb [41]

Answer:

100% chance. I don't know if you mean a certain color. We need to know that color if you want us to help you. But, if you really just want to pick a marble, replace it, and pick another, you will ALWAYS get a marble.

6 0

2 years ago

Which matrix represents the system of equations shown below<br> Plz help..<br> See picture

Furkat [3]

Basically

just put the coeficinets of each variable in the apropriate row

example
ax+by=c and
dx+ey=f

would go in like this
$\left[\begin{array}{ccc}a&b&|c\\d&e&|f\end{array}\right]$

so
3x+1=1 and
0x-1y=5

$\left[\begin{array}{ccc}3&1&|1\\0&-1&|5\end{array}\right]$

D is answer

4 0

3 years ago

Read 2 more answers

5 1/3 added to four times a number is 38 14/15. what is the number? please show work

Lesechka [4]

38 14/15 - 5 1/3 = 33 3/5 or 33.6
33.6/4= 8.4
8.4= 8 2/5

the answer is 8 2/5

6 0

3 years ago

Will mar brainluest

vlada-n [284]

Answer:

I think it would be c!