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MariettaO [177]
3 years ago
11

I’ll give brainlist award please answer

Mathematics
1 answer:
lina2011 [118]3 years ago
5 0
For answering multiple choice, you can do the following:

Observe the diagram, noting that one curve has positive slope, and the other has negative slope.
Looking at the equations,
if x and y are on the same side of the equal sign, (which is the case here), then
- coefficients of x and y have equal signs (both+, or both -) then the equation has negative slope.
- coefficients of x and y have different signs (+-, or -+), then the equation has positive slope.
We see the second system has both equations with positive slope, and the third system has both equations with negative slopes.  They're out!

Next, we check the y-intercept of the first equation (by setting x=0),
first system: 0+2y=-10 => y-intercept=-5, slope=-1/2 Good
fourth system: 0-2y=-10 => y-intercept=+5  No good.

Finally, check the x-intercept of the second equation of the first system (by setting y=0)
first system: 3x-0=12 => x-intercept = 12/3=+4, slope = +3  good

So we conclude the first system is the correct answer.
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20 COINS
Leto [7]

The surface area of a cylinder is given by

A_A = 2\pi rh

which is the surface area of cylinder A.

To compute the surface area of cylinder B, we have to map (r,h)\mapsto (2r, 2h) and we have the following formula

A_B = 2\pi(2r)(2h)

If we manipulate the second expression, we have

A_B = 8\pi rh

Which implies

\dfrac{A_B}{A_A} = \dfrac{8\pi rh}{2\pi rh} = 4

5 0
3 years ago
Trapezoid ZOID is congruent to trapezoid TRAP. If vertices 2 and have coordinates (0, -2) and (0, -5) respectively, which of the
vlada-n [284]

The trapezoids are congruent if the corresponding sides of each trapezoid are equal

The option that gives the possible coordinates for the vertex <em>I</em> is the option;

\underline{(-4.5, -5)}

Reason:

The given coordinates of the trapezoid TRAP = T(3, 5), P(3 2), R(6, 5), and A(7.5, 2)

The given coordinates of the trapezoid ZOID = Z(0, -2), and D(0, -5)

Required: The possible coordinates for a vertex on ZOID

Solution:

The given points of the trapezoid are the height of the trapezoid ZOID

The possible vertex of <em>I</em>, and <em>O</em> are;

  • I(4.5, -5), I(-4.5, -5), O(3, -2), O(-3, -2)

Therefore;

The option that gives the possible coordinates (position) of a vertex <em>I</em> is the option \underline{(-4.5, -5)}

Learn more here:

brainly.com/question/12871672

3 0
3 years ago
There are (n r) different linear arrangements of n balls of which r are black and n-r are white. give a combinatorial explanatio
Vanyuwa [196]

Answer:

\frac{n!}{r!(n-r)!}

Step-by-step explanation:

Combinatorial explanation:

The n balls have to be arranged in n positions and the only distinction is where are the black and where white balls are.

We can choose the position of black balls in \binom{n}{r} ways, therefore, white ones are on the remaining positions.

Using binomial we can have explanation written below:

The balls can be arranged in n! possible permutations.

To be precise one particular arrangement includes r!(n-r)! permutations. Since r black balls can be permuted in r! ways and white balls in (n-r)! different orders.

So basically it yields,

r! \times (n-r)! permutations.

So the actual amount is,

\frac{r!}{(n-r)!}= \binom{n}{r}=\binom{n}{n-r}

6 0
4 years ago
2.1n -5.31 = 18 <br> Question : Find n <br> Pls Answer !!
Daniel [21]

Answer:

n = 11.1

Step-by-step explanation:

2.1n = 18 + 5.31

2.1n = 23.31

n = 23.31 / 2.1

n = 11.1

Hope that helps!!!!

3 0
3 years ago
Read 2 more answers
Find the missing angle measure
TiliK225 [7]

Answer:

1) 122°

2) 151°

Step-by-step explanation:

1)

As these two angles are supplementary (They add together to equal 180°) we can setup the equation and solve for x.

58+x=180\\\\x=180-58\\\\x=122

2)

Again, these two angles are supplementary we can setup the equation and solve for x

29+x=180\\\\x=180-29\\\\x=151

7 0
4 years ago
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