All categories

3 years ago

Can anyone help me pls

Mathematics

1 answer:

Nikitich [7]3 years ago

3 0

9514 1404 393

Answer:

A. some values (x = 4)

B. all values

C. no values

Step-by-step explanation:

If you subtract the right-side expression from both sides of an equation, so you get something of the form ...

f(x) = 0

Then there are three possibilities:

f(x) is some function of x . . . . "some values" make it true*

f(x) = 0 . . . . "all values" make it true; the equation is an identity

f(x) = constant (non-zero) . . . . "no values" of x will make it true

___

A: 3x = x +8

3x -(x +8) = 0

2x -8 = 0 . . . . . . . . true for "some" values of x, namely, x = 4

B: 5x -(x +x +x +x +x) = 0

0 = 0 . . . . . . . . . . . true for "all" values of x

C: 2(x +5) -(2x +5) = 0

2x + 10 -2x -5 = 0

5 = 0 . . . . . . . . . . . true for "no values" of x (always FALSE)

_____

* The possibility exists that the function f(x) does not have 0 in its range. In that case, there are no real solutions for the equation. For example |x|+1 = 0 has no solutions. For expressions linear in x, there will always be a solution.

You might be interested in

what are two decimals with thousandths that would give 0.2 when rounded to the nearest tenth and 0.20 when rounded to the neares

egoroff_w [7]

Ur answer it 0.04 bc u would take the 0.2•0.20=0.04

3 0

4 years ago

Please help meeeee!!!! 100 points and will mark as brainliest

Artyom0805 [142]

1) the degrees of a six-sided figure is 720 degrees
so x= 720-632 (given degrees in all)
x=88 degrees

2) the degrees of a five-sided figure is 540
so x= 540-441
x=99

then 180-99=81
so, y=81

6 0

4 years ago

Read 2 more answers

E temperature t of a metal sphere is inversely proportional to the distance from the centre of the sphere (the origin (0, 0, 0))

olasank [31]

(-x, -y, -z) the vector form (x, y, z) to the origin, in the direction of the greatest increase.

<h3>How to calculate temperature?</h3>

The quantity or amount of radiation contained in material or item, as measured by a temperature or sensed by touch and stated on a numerical scale.

The temperature T of a ball bearing is inverse to the length first from the origin, which we consider to be the center of the ball. The temperature at the exact location

(x, y, z) is a point on the sphere, the temperature at this point is given by

$T(x,y,z)= \dfrac{k}{(x^2 +y^2+z^2)^{1/2}}$

Where k is constant, then we have

T(1, 2, 2) = k/3 = 170

k = 510

$T(x,y,z)= \dfrac{510}{(x^2 +y^2+z^2)^{1/2}}$

Then we have

$\rm \triangledown T = \left ( -\dfrac{510x}{(x^2 +y^2+z^2)^{1/2}}, -\dfrac{510y}{(x^2 +y^2+z^2)^{1/2}}, \dfrac{510z}{(x^2 +y^2+z^2)^{1/2}} \right )\\\\\\\triangledown T (1, 2, 2) = -\dfrac{510}{27} (1, 2, 2) =-\dfrac{170}{9} (1, 2, 2)$

Then the direction will be from (1, 2, 2) to (4, 3, 5) will be (3, 1, 3)

So u = (3/√19, 1/√19, 3/√19)

Then we get

$\rm \triangledown T \cdot u = \dfrac{-170}{9}(1, 2, 2) \cdot \left (\dfrac{3}{\sqrt{19}}, \dfrac{1}{\sqrt{19}}, \dfrac{3}{\sqrt{19}} \right )\\\\\\\triangledown T \cdot u = - \dfrac{170}{9\sqrt{19}} (3 + 2 + 6)\\\\\\\triangledown T \cdot u = -\dfrac{1870}{9\sqrt{19}}$

The direction of the greatest inverse in the temperature is given by any vector parallel to and having the same direction $\triangledown$ T. (-x, -y, -z) the vector form (x, y, z) to the origin, in the direction of the greatest increase.