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Novosadov [1.4K]
3 years ago
14

2x - y = 17 2x + 3y = -19 This is elimination not sublimation and I really need help.

Mathematics
1 answer:
blsea [12.9K]3 years ago
4 0

Answer:

(4,-9) or x=4, y=-9

Step-by-step explanation:

Add the equations in order to solve for the first variable. Plug this value into the other equations in order to solve for the remaining variables.

Theres also a graph attacthed of the equations intersecting if that helps you. :)

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In a class where there are a total of 80 pupils, 20 are girls and the remaining
babymother [125]

Answer:

75%

Step-by-step explanation:

First find the number of boys.

80 - 20 = 60

Now find the percentage my taking the number of boys upon the total, times that by 100 which gives the percentage.

\frac{60}{80} × 100 = 75%

8 0
2 years ago
Read 2 more answers
Find the missing number (1+_ ÷7+4)÷8=4/7​
GaryK [48]

The answer to (1+_÷7+4)÷8= 4/7 is -3 I believe

3 0
3 years ago
a random sample of 510 high school students has a normal distribution. The sample mean average ACT exam score was 21 with a 3.2
34kurt

Answer:

CI = 21 ± 0.365

Step-by-step explanation:

The confidence interval is:

CI = x ± SE * CV

where x is the sample mean, SE is the standard error, and CV is the critical value (either t score or z score).

Here, x = 21.

The standard error for a sample mean is:

SE = σ / √n

SE = 3.2 / √510

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The critical value is looked up in a table or found with a calculator.  But first, we must find the alpha level and the critical probability.

α = 1 - 0.99 = 0.01

p* = 1 - (α/2) = 1 - (0.01/2) = 0.995

Using a calculator or a z-score table:

P(x<z) = 0.995

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Therefore:

CI = 21 ± 0.142 × 2.576

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Round as needed.

8 0
3 years ago
what is the lateral area of a square pyramid with a side length of 11.2 centimeters and slant height 20 centimeters
hammer [34]
Lateral sides consiste of 4 congruentisosceles triangle 
lateral area 

= 4 * 0.5 * 11.2 * 20
=   448 cm^2
4 0
3 years ago
28. Barrett's mom has a flower vase that is shaped like a perfect cylinder.
zimovet [89]

Answer:

Vase volume is 452.16 in³

Step-by-step explanation:

The question asks for the volume of a cylinder of radius r and height h.  The relevant formula is V = (pi)(r)^2*h

With h = 9 in and r = 4 in, that max volume (of water) is

V = (3.14)(4 in)^2*(9 in) = 452.`16 in³

5 0
3 years ago
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