3 years ago

2x + 3y- z = 13 3x - 4y+z = -2 x + 2y + 2z= 21

Mathematics

2 answers:

Oksana_A [137]3 years ago

8 0

What’s the question ?

11111nata11111 [884]3 years ago

8 0

Answer:

Step-by-step explanation:

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Please help me solve this I need some help

Agata [3.3K]

Answer:

f = 8

Step-by-step explanation:

Apply the distributed property, so it now looks like this: 2f - 10 = 6
Add 10 to each side, so it now looks like this: 2f = 16
Divide each side by 2 to cancel out the 2 next to f. It should now look like this: f = 8

I hope this helps!

7 0

3 years ago

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I still nee help with this q9

katen-ka-za [31]

Answer:

it is A

D"" (7,2)

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3 years ago

You are trying to estimate the average amount a family spends on food during a year. In the past the standard deviation of the a

timama [110]

Answer:

the number of families needed for the survey is 2,157

Step-by-step explanation:

The computation of the number of families needed for the survey is shown below:

Given that

The Standard deviation is $900

Service level = 99%

z value at 99% = 2.58

Expenditures = $50

Based on the above information

The number of families needed for the survey is

$n = (\frac{zs}{E})^2\\\\= (\frac{2.58\times 900}{50})^2$

= 2,157

Hence, the number of families needed for the survey is 2,157

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3 years ago

Please answer this question

larisa86 [58]

Answer: I think B

Step-by-step explanation:

Not fully sure

7 0

3 years ago

Ramon wants to balance his checking account. He has $2340 in the account. He writes a check for $140. He deposits a check for $2

Sergio039 [100]

He writes a check so he takes out the money so 2340 - 140 and then he deposits so because 2340 - 140 = 2,200 so, when he deposits 2200 + 268 then it will be the answer $2468.

$2468

I had this question yesterday or the other day so yeah hope this helps! ^^

5 0

3 years ago