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Ilya [14]
2 years ago
7

Please answer this simple question !!!

Mathematics
1 answer:
Nastasia [14]2 years ago
6 0
The final answer is (2,1).

Step 1: Solve for either x or y in one of the two equations.

     x + 3y = 5
         - 3y  - 3y
----------------------
     x = -3y + 5
  

Step 2: Substitute the expression you got for x into the opposite equation.

-3y + 5 - 3y = -1
  -6y + 5 = -1
         - 5    - 5
--------------------
  -6y = -6
 ------  -----
  -6       6
 
    y = 1


Step 3: Plug in the solution you got for y into either of the 2 equations.

x + 3(1) = 5
  x + 3 = 5
      - 3  - 3
---------------
  x = 2





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The printer can print 168 papers in 21 minutes. Enter the number of paper the printer can print in 10 minutes.
kolbaska11 [484]

Answer:

80 pages

Step-by-step explanation:

We can use ratios to solve

168 papers          x papers

------------------ = -----------------

21 minutes          10 minutes

168*10 = x * 21

1680 = 21x

Divide each side by 21

1680/21 = 21x/21

80 = x

80 pages

4 0
3 years ago
Last autumn, julia noticed something interesting as she blew up spherical balloons for harris's birthday party. she calculated t
Vikki [24]
To find whether the volume would be doubled when the radius is,we can find the volume of the two balloons.

The formula of a sphere is:
\frac{4}{3} \pi \: {r}^{3}
Let's take 丌 as 3.14

The volume of the balloon with 4cm radius:
\frac{4}{3}(3.14)  \times  {4}^{3}  \\  = 4.18667 \times 64 \\  = 267.94688

The volume of the balloon with 8cm radius:
\frac{4}{3}(3.14)  \times  {8}^{3}  \\  = 4.18667 \times 512 \\  = 2143.57504
As we can see,
267.94668 × 2 = 535.89 ≠2145.56

Thus,she wouldn't discover that the volume is twice as big when the radius is doubled.

Hope it helps!
4 0
3 years ago
Read 2 more answers
Why would i use a straightedge to measure the length of a segment?
Simora [160]
You would measure the length of a segment with a straightedge because it is free from curves and can help measure a segment because it is straight.
6 0
2 years ago
Which equation represents a line that is parallel to 2x-3y=9
Sever21 [200]
Two lines are parallel if they have the same slope but a different y intercept. A line with the same slope and y int as another one will be the exact same
Slope in standard form is -a/b, so your slope is 2/3 and your y int is -3
For example:
y=2/3x+1
4 0
3 years ago
A veterinarian collects data on the number of times race horses are raced during their careers. The veterinarian finds that the
SpyIntel [72]

Answer:

c. (12.12, 18.48)

Step-by-step explanation:

Hello!

The study variable is X: number of times a racehorse is raced during its career.

The average number is X[bar]= 15.3 and the standard deviation is S= 6.8 obtained from a sample of n=20 horses.

To estimate the population mean you need that the variable has a normal distribution, in this case, we have no information about its distribution so I'll assume that it has a normal distribution. With n=20 the most accurate statistic to use for the estimation is a Students-t for one sample, the formula for the interval is:

X[bar] ± t_{n-1;1-\alpha /2} * \frac{S}{\sqrt{20} }

t_{n-1;1-\alpha /2} = t_{19;0.975}= 2.093

[15.3 ± 2.093 * \frac{6.8}{\sqrt{20} }]

[12.12; 18.48]

Using a significance level of 95% you'd expect that the true average of times racehorses are raced during their career is included in the interval [12.12; 18.48].

I hope it helps!

8 0
3 years ago
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