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2 years ago

15

Which system of equations does not have a real solution? y = x6 2 + 3x - 5 and x + y = -10 y = x6 2 + 3x - 5 and 4x + 5y = 20 y

= x 62+ 3x- 5 and x + y = -9

2 answers:

Yuri [45]2 years ago

5 0

I think it would be the first one but im not to positive

natta225 [31]2 years ago

5 0

Answer:

y = x ^2 + 3x - 5 and x + y = -10

Step-by-step explanation:

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Soni has 196 pencils. If she puts equal amounts of pencils into eight boxes, she has four pencils left. How many pencils does sh

Kryger [21]

The best way to work this out is to find the total number, minus the remained. In this case, subtract four from 196, and this gives you 192. As you've got to put the pencils into 8 boxes, you have to divide 192 by 8, and this gives you 24.
Therefore, Soni can put 24 pencils can be put into each box, with four pencils remaining.
Hope this helps :)

7 0

2 years ago

What is the solution to the following system?

leva [86]

Answer:

(4,3,2)

Step-by-step explanation:

We can solve this via matrices, so the equations given can be written in matrix form as:

$\left[\begin{array}{cccc}3&2&1&20\\1&-4&-1&-10\\2&1&2&15\end{array}\right]$

Now I will shift rows to make my pivot point (top left) a 1 and so:

$\left[\begin{array}{cccc}1&-4&-1&-10\\2&1&2&15\\3&2&1&20\end{array}\right]$

Next I will come up with algorithms that can cancel out numbers where R1 means row 1, R2 means row 2 and R3 means row three therefore,

-2R1+R2=R2 , -3R1+R3=R3

$\left[\begin{array}{cccc}1&-4&-1&-10\\0&9&4&35\\0&14&4&50\end{array}\right]$

$\frac{R_2}{9}=R_2$

$\left[\begin{array}{cccc}1&-4&-1&-10\\0&1&\frac{4}{9}&\frac{35}{9}\\0&14&4&50\end{array}\right]$

4R2+R1=R1 , -14R2+R3=R3

$\left[\begin{array}{cccc}1&0&\frac{7}{9}&\frac{50}{9}\\0&1&\frac{4}{9}&\frac{35}{9}\\0&0&-\frac{20}{9}&-\frac{40}{9}\end{array}\right]$

$-\frac{9}{20}R_3=R_3$

$\left[\begin{array}{cccc}1&0&\frac{7}{9}&\frac{50}{9}\\0&1&\frac{4}{9}&\frac{35}{9}\\0&0&1&2\end{array}\right]$

$-\frac{4}{9}R_3+R_2=R2$ , $-\frac{7}{9}R_3+R_1=R_1$

$\left[\begin{array}{cccc}1&0&0&4\\0&1&0&3\\0&0&1&2\end{array}\right]$

Therefore the solution to the system of equations are (x,y,z) = (4,3,2)

Note: If answer choices are given, plug them in and see if you get what is "equal to". Meaning plug in 4 for x, 3 for y and 2 for z in the first equation and you should get 20, second equation -10 and third 15.

7 0

2 years ago

fomenos

1 it’s the most educated guess.

6 0

1 year ago

$976 and 25% intrest for 4 years

tatuchka [14]

Answer:

<h3>1952.00</h3><h3>I=976</h3>

Step-by-step explanation:

<u><em>SIMPLE INTEREST FORMULA:</em></u>

I- Interest

P- Principal

R- Rate

T-Time

P=976

R=25

T=4 years

976*25%4

25%=0.25

Solve.

Multiply.

976*0.25*4

976*0.25*4=976

I=976

976 and $1952.00, which is our answer.

7 0

3 years ago

The value of a movie poster is increasing at a rate of 3.5% per

Bingel [31]

Answer:

44.55

Step-by-step explanation:

I actually didn't get the right answer and I just edited it right now I'm sorry I dont have an explanation!

6 0

2 years ago