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dmitriy555 [2]
3 years ago
8

260 wk = how many years

Mathematics
1 answer:
jekas [21]3 years ago
7 0
260 weeks is 5 years.
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3x + 2y + z = 8 2x - 3y + 2z = -16 x + 4y - z = 20
padilas [110]
I'll do a similar problem, and I challenge you to do this on your own using similar methods!

x+5y+2z=23
8x+4y+3z=12
9x-3y-7z=-10

Multiplying the first equation by -8 and adding it to the second one (to get rid of the x) and also multiplying the first equation by -9 and adding the third one to get rid of the x there too, we end up with

-36y-13z=-92
and
-48y-25z=-217

Multiplying both equations by -1, we get
36y+13z=-92
48y+25z=217

Multiplying the (new) first equation by -4/3 and adding it to the second (to get rid of the y), we get
(7+2/3)z=94+1/3

Dividing both sides by (7+2/3) to separate the z, we get
z=\frac{282/3}{23/3} = \frac{282}{23}

Plugging that into 
48y+25z=217, we can subtract 25z from both sides and divide by 48 to get 
y= \frac{217-25z}{48} =\frac{217-25*282/23}{48}

Lastly, we plug this into x+5y+2z=23 to get
x=23-5y-2z by subtracting 5y+2z from both sides to get 
x=23- \frac{217-25*282/23}{48}*5-2*282/23 

Good luck, and feel free to ask with any questions!
4 0
3 years ago
Solve for x. Enter the solutions from least to greatest. x^2 +7=43
sashaice [31]

Answer:

x = - 6, x = 6

Step-by-step explanation:

Given

x² + 7 = 43 ( subtract 7 from both sides )

x² = 36 ( take the square root of both sides )

x = ± \sqrt{36} = ± 6

Thus

x = - 6, x = 6

7 0
3 years ago
Read 2 more answers
13 cm<br> 5 cm<br> 7 cm<br> 12 cm<br> Find the surface area.
Radda [10]

Answer: 37cm

Step-by-step explanation: 5cm + 13cm + 7cm + 12cm = 37cm

5 0
2 years ago
Read 2 more answers
1. What is 25% of 50?<br> ____- is ___ % of<br> Solution:_____
Sergeeva-Olga [200]
12.5 - is 25% of
Solution: 50
5 0
4 years ago
This is so confusing, pls help!!
liq [111]

Answer:

2 1/4 cubic units is the answer

3 0
3 years ago
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