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tekilochka [14]
3 years ago
7

The control group in an experiment is the group that did not have a variable changed.

Mathematics
1 answer:
Amiraneli [1.4K]3 years ago
4 0
The answer is
true.
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Julio bought 4 pencils and 3 erasers for $0.37 and David paid $0.33 for 3 pencils and 4 erasers. What is the cost of one pencil?
grigory [225]

cost of pencil = x = 0.07

and cost of eraser = y = 0.03

Step-by-step explanation:

let cost of pencil = x

and cost of eraser = y

So, we have equations:

4x+3y=0.37\\3x+4y=0.33

Solving both equations to find value of x and y

Let:

4x+3y=0.37\,\,\,eq(1)\\3x+4y=0.33\,\,\,eq(2)

Multiply eq(1) with 4 and eq(2) with 3 and subtract

16x+12y=1.48\\9x+12y=0.99\\-\,\,\,-\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,-\\--------\\7x=0.49\\x=0.07

Putting value of x in equation 1:

4x+3y=0.37\\4(0.07)+3y=0.37\\0.28+3y=0.37\\3y=0.37-0.28\\3y=0.09\\y=0.03

So, x= 0.07 and  y = 0.03

cost of pencil = x = 0.07

and cost of eraser = y = 0.03

Keywords: System of equations

Learn more about system of equations at:

  • brainly.com/question/9045597
  • brainly.com/question/3739260
  • brainly.com/question/13168205

#learnwithBrainly

4 0
3 years ago
Help me with this please :)
algol13

Answer:

Hey there!

X+Y=0.

For example, two numbers that are equally far from the 0 on a number line are -2 and 2.

-2+2=0

Hope this helps :)

6 0
3 years ago
Read 2 more answers
In particular this amazing conjecture asserts that if ζ(1) is equal to 0, then there are an infinite number of rational points (
GuDViN [60]

Answer:

i honestly dont really know

Step-by-step explanation:

7 0
3 years ago
The makers of a popular brand of laundry detergent have discovered a new secret ingredient that they believe will boost the clea
astraxan [27]

Answer:

The p-value is of 0.046 < 0.05, which means that there is a low probability of the results happening by random chance, and thus there is significant evidence to conclude that the new formula cleaned the shirts significantly better than the old formula.

Step-by-step explanation:

If the p-value is less than the significance level, it means that there is a low probability of the results happening by random chance.

In this question:

The p-value is of 0.046 < 0.05, which means that there is a low probability of the results happening by random chance, and thus there is significant evidence to conclude that the new formula cleaned the shirts significantly better than the old formula.

6 0
3 years ago
The number of members f(x) in a baseball club increased by 45% every year over a period of x years. The function below shows the
rjkz [21]
The number of members in a baseball club is shown with the function:
f ( x ) = 25 * 1.45^x
When: x = 0: f ( 0 ) = 25
When x = 1  f ( x ) = 25 * 1.45 ≈ 36
When x = 3,  f ( x ) = 25 * 1.45³ ≈ 76
Answer:
Graph D best represents this function. 
5 0
3 years ago
Read 2 more answers
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