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2 years ago

Please help me 10 points pleaseee helppp

Mathematics

1 answer:

cestrela7 [59]2 years ago

7 0

There’s a whole bunch going on i don’t know what to help you with

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If the point (4,-2) is included in a direct variation relationship, which point also belongs in this direct variation? A. (-4,2)

IceJOKER [234]

Answer:

(-4,2) belongs in this direct variation.

Step-by-step explanation:

Let the direct variation relationship is expressed by the equation y = mx ........ (1), where x and y are in direct variation and k is the variation constant.

Now, the point (4,-2) is included in the direct variation relationship, then from equation (1) we get, -2 = 4m

⇒ $m = - \frac{1}{2}$

Therefore, the equation (1) becomes $y = - \frac{1}{2}x$

⇒ x + 2y = 0 ......... (2)

Now, from the given four options only the point (-4,2) satisfies the relation (2).

Hence, (-4,2) belongs in this direct variation. (Answer)

5 0

3 years ago

Help ?? Anyone and how

ELEN [110]

Answer:

just insert the x numbers in the calculation.. so for x = - 3 - > (- 3) / 2 +4 = 2.5

Step-by-step explanation:

x - 2 = y 3

and so on

7 0

3 years ago

when seven is added to a certain number the result is the same as subtracting twice the number from sixteen what is the number .

jeyben [28]

The meaning of the question is

Let the unknown number be x

Therefore x+7=16-2x
Now 2x+x=16-7
3x=9
X=9/3
x=3

6 0

3 years ago

10 ,15 as a simple form

NikAS [45]

10,15 in the simplest form is 2,3

5 0

3 years ago

PLEASE OF YOU CAN SHOW THE WORK:

Alex777 [14]

Answer:

$x\approx24^\circ$

Step-by-step explanation:

We know that r and s have a combined length of 70. Therefore:

$r+s=70$

Notice that we can determine r by using the Pythagorean Theorem. In this case, r is the hypotenuse, and 20 and 8 are the legs. Therefore:

$a^2+b^2=c^2$

Substituting 20 and 8 for a and b and r for c yields:

$20^2+8^2=r^2$

Compute:

$464=r^2$

Therefore:

$r=\sqrt{464}=\sqrt{16\cdot 29}=4\sqrt{29}$

Now, we can determine s. We know that:

$s+r=70$

So, by substitution:

$s+4\sqrt{29}=70$

Therefore:

$s=70-4\sqrt{29}$

Now, notice that, with respect to x, 20 is the opposite side and s is the hypotenuse.

Therefore, we can use the sine ratio. The sine ratio is the ratio between a right triangles opposite side to its hypotenuse.

In this case, the opposite to x is 20, and the hypotenuse is s, or 70-4√29. Therefore:

$\displaystyle \sin(x^\circ)=\frac{20}{s}$

By substitution:

$\displaystyle \sin(x^\circ)=\frac{20}{70-4\sqrt{29}}$

Take the inverse sine of both sides:

$\displaystyle x^\circ=\sin^{-1}\Big(\frac{20}{70-4 \sqrt{29}} \Big)$

Use a calculator. Therefore:

$x\approx24.37^\circ\approx24^\circ$

8 0

2 years ago