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3 years ago

Pls do 2-4, no fake answers to get points i will give brainliest

Mathematics

2 answers:

Talja [164]3 years ago

8 0

Answer: -2.

Here’s how you solve questions like these:

First of all, you have to learn the rule on the number line.

if it’s an addition problem, go forward.

if it’s a subtraction problem, go backwards.

if the number is positive, turn to the right.

if the number is negative, turn to the left.

So pretend you’re in between a number line that goes from -10 to 10, or on 0.

< -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 >

Take the first number and look at the rule. Since 2 is positive, you start at that number and face to the right.

< -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 >
>
Next, you take the symbol in between the two numbers. Since it’s the minus sign, or a subtraction problem, you have to get ready to walk backwards But before you do that, check the last number. Since 4 is positive, you still have to face to the right and move 4 spaces backwards.

< -10 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 >
< < < <

If this is confusing, I’ll demonstrate it in the comments again.

klemol [59]3 years ago

7 0

-2 pretty sure hope this helps

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Will mark Brianliest please answer :)

Brilliant_brown [7]

Answer:

3.5×10^4=35000

Step-by-step explanation:

Consider the value

3.5

we are saying that we are counting in units (1's) in that we have

of 1's

'.....................................................................................

Consider the value

3.5

. Now we are saying we have

of tens. That is; 3 lots of 10 is 30 and

of 10 is 5 so we have

'.................................................................................

Note that

is 100

Consider the value

3.5

. Now we are saying we have

100

So if we are counting in 100's then the decimal point stays where

it is and we move the number of 3.5 to the left until the

3 becomes hundreds.

Note that we have to insert a place holder of 0 just to the left of the decimal point to make sure the three is viewed as in the hundreds.

3.5

−−−−−−−−−−−−−−−−−−→

slide to the left 2 places

350.0

6 0

3 years ago

Electric charge is distributed over the disk x2 + y2 ≤ 16 so that the charge density at (x, y) is rho(x, y) = 2x + 2y + 2x2 + 2y

professor190 [17]

Answer:

Required total charge is $256\pi$ coulombs per square meter.

Step-by-step explanation:

Given electric charge is dristributed over the disk,

$x^2=y^2\leq 16$ so that the charge density at (x,y) is,

$\rho (x,y)=2x+2y+2x^2+2y^2$

To find total charge on the disk let Q be the total charge and $x=r\cos\theta,y=r\sin\theta$ so that,

$Q={\int\int}_Q\rho(x,y) dA$ where A is the surface of disk.

$=\int_{0}^{2\pi}\int_{0}^{4}(2x+2y+2x^2+2y^2)dA$

$=\int_{0}^{2\pi}\int_{0}^{4}(2r\cos\theta+2r\sin\theta+2r^2 \cos^{2}\theta+2r^2\sin^2\theta)rdrd\theta$

$=2\int_{0}^{2\pi}\int_{0}^{4}r^2(\cos\theta+\sin\theta)drd\theta+2\int_{0}^{2\pi}\int_{0}^{4}r^3drd\theta$

$=\frac{2}{3}\int_{0}^{2\pi}(\sin\theta+\cos\theta)\Big[r^3\Big]_{0}^{4}d\theta+2\int_{0}^{2\pi}\Big[\frac{r^4}{4}\Big]d\theta$

$=\frac{128}{3}\int_{0}^{2\pi}(\sin\theta+\cos\theta)d\theta+128\int_{0}^{2\pi}d\theta$

$=\frac{128}{3}\Big[\sin\theta-\cos\theta\Big]_{0}^{2\pi}+128\times 2\pi$

$=\frac{128}{3}\Big[\sin 2\pi-\cos 2\pi-\sin 0+\cos 0\Big]+256\pi$

$=256\pi$

Hence total charge is $256\pi$ coulombs per square meter.

3 0

3 years ago

What is the slope of the line represented by the equation?<br> –2x + y = –1

Harrizon [31]

Isolate the y to one side so we get: y = 2x - 1
The slope of the line is 2.

8 0

2 years ago

Read 2 more answers

<img src="https://tex.z-dn.net/?f=%20%5Csqrt%5B3%5D%7Bx%20-%201%7D%20" id="TexFormula1" title=" \sqrt[3]{x - 1} " alt=" \sqrt[3]

shusha [124]

So the -1 is under the check mark too?

7 0

3 years ago

What is the pattern here?

tigry1 [53]

To get the number at the back, you would need to multiply the number in front by 3 and minus 1.
The answer would be A

8 0

3 years ago