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kow [346]
4 years ago
11

1.

Mathematics
1 answer:
astra-53 [7]4 years ago
7 0
1. Choose C. When you want to eliminate a, the equation has to have opposite values that cancel out. If you already have 4a, you want to get -4a, which is -4*a shown in the third option.

2. -3. Since we already have 3 y, we want -3 y so it can cancel out since 3-3=0.

3. -6. We have 6x already so we want -6x to cancel out since 6-6=0.

4.
-5x+20y=-35
5x+9y=6
29y=-29
y=-1

5x+9(-1)=6
5x-9=6
5x=15
x=3

Final answer: (3,-1)

5. The error is in step 2 since they forgot to multiply -2(10)
You might be interested in
To which subset of real numbers does -3 belong?
inessss [21]
<h3>Answer: C) integers and rational numbers</h3>

Explanation:

The set of integers is {..., -3, -2, -1, 0, 1, 2, 3, ...} basically any number that does not have a decimal or fractional part to it. We can say that this set is composed of positive and negative whole numbers along with 0. So this is why -3 is in the set of integers.

The value -3 is not in the set of whole numbers because the set of whole numbers is {0, 1, 2, 3, 4, 5, 6, ...}, so this rules out choice D.

Choice B is also eliminated because -3 is a rational number. We can write -3 as a fraction of two integers, example: -3 = -3/1. Any rational number is not irrational, and vice versa.

Choice A is ruled out because it's not the most complete answer (though its technically true).

8 0
3 years ago
If f(x)=4-3x*2 then f(-2) is
yanalaym [24]

Answer:

16

Step-by-step explanation:

f(-2)=4-3(-2)*2

f(-2)=4-3(-4)

f(-2)=4+12

f(-2)=16

7 0
3 years ago
If you just comment just to comment I’ll report you ok <br><br> - geometry
gtnhenbr [62]

Answer:

6644.7 cubic meters

Step-by-step explanation:

\text {Fomula for volume of a cube: } V=s^3\\s-\text {Side Measure}

The side measure is 18.8m.

V=18.8^3\\V= 18.8*18.8*18.8\\\boxed{V=6644.672}

6644.672 ≈ 6644.7

The volume of the cube should be 6644.7 cubic meters.

Brainilest Appreciated.

5 0
4 years ago
I’m very confused- helppp
german

Answer:

D multiply second equation by 2

5 0
2 years ago
C = 50 + 0.9Y Assume further that planned investment Ig, government spending G and net exports Xn are independent of the level o
mamaluj [8]

Answer: Hence, the value of real output produced Y = 900.

Step-by-step explanation:

Since we have given that

Y=C+I_g+G+Xn------------(1)

and

C=50+0.9Y-----------------(2)

And

I_g=30\\\\G=0\\\\X_n=10

We need to find the value of Y:

From eq(1) and eq(2), we get that

Y=50+0.9Y+I_g+G+X_n\\\\Y-0.9Y=50+30+0+10\\\\0.1Y=90\\\\Y=\dfrac{90}{0.1}\\\\Y=900

Hence, the value of real output produced Y = 900.

6 0
3 years ago
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