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3 years ago

5

solve the following system of equations, express your answer with an orderd pair in the format, no spaces between the numbers or

symbols 3x+4y=16 -4x-3y=-19

1 answer:

Vinil7 [7]3 years ago

6 0

Answer:

Step-by-step explanation:

(4,1)

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WILL MARK BRAINLIEST, PLEASE DON'T DO THOSE OFFSITE LINKS I KNOW BETTER THAN TO CLICK EM

Alexus [3.1K]

Answer:

A p

Step-by-step explanation:

We have

$12x {}^{ - 3} y {}^{ - 1}$

Remeber that

$x {}^{ - n} = \frac{1}{x {}^{n} }$

$12 \frac{1}{x {}^{3} } \frac{1}{y {}^{1} }$

Now, plug in

So now we plug in -1 for x and 5 for y

$12 \frac{1}{ { - 1}^{3} } \frac{1}{5 {}^{1} }$

Simplify

$- \frac{12}{5}$

A is the answer.

3 0

3 years ago

Twenty-eight athletes participate in a 100-meter race. The time of each athlete is measured during the qualification round. The

andriy [413]

The average time of the 20 athletes who did not qualify for the final is 11.2 seconds .

<u>Step-by-step explanation:</u>

Here we have , Twenty-eight athletes participate in a 100-meter race. The time of each athlete is measured during the qualification round. The average time is 11 seconds. The 8 athletes with the fastest time qualified for the final. The average time of these 8 athletes is 10.5 seconds. Let's have equations for this:

$\frac{x_1+x_2+.....+x_2_8}{28} = 11$ where $x_1, x_2, ....., x_2_8$ are athletes

⇒ $x_1 + x_2 + .. + x_2_8 = 11(28)= 308$

⇒ $(x_1 + x_2 + .. + x_8 )+ (x_9+x_1_0+...+x_2_8) = 308$

⇒ $(\frac{x_1 + x_2 + .. + x_8}{8} )(8)+ (\frac{x_9+x_1_0+...+x_2_8}{20} )(20) = 308$

⇒ $10.5(8)+m(20) = 308$ , where m is average time of the 20 athletes who did not qualify for the final.

⇒ $84+m(20) = 308$

⇒ $20m= 224$

⇒ $m=11.2$

∴ The average time of the 20 athletes who did not qualify for the final is 11.2 seconds .

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3 years ago

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Lyrx [107]

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7 0

3 years ago

A minibus sets off at 7.30 am and arrives

olga_2 [115]

Answer:

4 hours and 15 minutes

Step-by-step explanation:

3 0

3 years ago

What is the midpoint of np if N(10, -14) and P(-16, -4)?

Virty [35]

Answer:

<h3>Midpoint = (-3 ,-9)</h3>

Step-by-step explanation:

$\\Midpoint =\left(\frac{x_2+x_1}{2},\:\:\frac{y_2+y_1}{2}\right)\\\\\left(x_1,\:y_1\right)=\left(10,\:-14\right),\:\\\left(x_2,\:y_2\right)=\left(-16,\:-4\right)\\\\=\left(\frac{-16+10}{2},\:\frac{-4-14}{2}\right)\\\\=(\frac{-6}{2}, \frac{-18}{2}\\ \\Simplify\\\\=\left(-3,\:-9\right)$

3 0

3 years ago