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3 years ago

12 - x = 20 - 5x I don't know how to solve this, please explain

1 answer:

8 0

12 - x = 20 - 5x

You see that -x and -5x both have an 'x' variable? This means they are 'like' terms. To get -x to the other side, we must add (if like terms are on opposite sides, do the opposite of what the sign says, e.g. - will be +)

12 = 20 - 4x

Now move 20 to the other side. Remember, do the opposite! Since 20 is positive, we must minus 20 to the other side.

-8 = -4x

To get x by itself, you will need to get rid of the coefficient of -4. -4x basically means -4 times x, so the opposite of that would be divide! Divide by -4

2 = x (Since both sides have a negative, they cancel out to give a positive)
x = 2

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There are 20 students in my class. Each student needs: .2 cups, 2 plates, 1 party hat and a pair of earphones. My teacher has 2

garik1379 [7]

Answer:

Simple, no. This would not be enough.

Step-by-step explanation:

This is because you mentioned that there are 20 students and each of them needed 2 plates. So, there would need to be at least 40 plates. Forks seem irrelevant in this question but if the teacher has 8 plates in 1 box and another 8 in the second box, that would sum up to 16 plates that are available. And the fact that the box doesn't even include the other items, should hint the lack of items available for the students.

This question seemed worded differently. But tried my best. :)

8 0

3 years ago

If the standard deviation of an exam is 5, the z-score us 1.95 and the mean is 80; what is the actual test score? (Round the ans

skad [1K]

If the standard deviation of an exam is 5, the z-score us 1.95 and the mean is 80, the actual test score is; 89.75

<h3>How to solve z-score problems?</h3>

We are given;

Standard deviation; s = 5

z-score = 1.95

Mean = 80

Formula for z-score is;

z = (x' - μ)/σ

Thus;

1.95 = (x' - 80)/5

1.95 * 5 = (x' - 80)

9.75 = x' - 80

x' = 80 + 9.75

x' = 89.75

Read more about Z-score Problems at; brainly.com/question/25638875

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6 0

2 years ago

Zander was given two functions: the one represented by the graph and the function f(x) = (x + 4)2. What can he conclude about th

baherus [9]

Answer:

On E2020 the answer is C

Step-by-step explanation:

They have the same y-intercept.

8 0

3 years ago

Read 2 more answers

two functions a and b are described as follows function a: y=8x+3 function b:the rate of change is 1 and the y intercept is 4 ho

AnnZ [28]

Answer:

Step-by-step explanation:

rate of change of function not necessary mean linear, it can be the slope of a tangent line.

a: y=8x+3 slope = 8

b: rate of change: 1

8-1=7

I wish this is true...

3 0

3 years ago

Y=3x + 4 solve this system ?

user100 [1]

→ Y = 3x + 4

→ Y = 7x

Hence, Value of Y = 7x

This process can only be done when we're using the way for linear equation (Shifting both sides) [Each value)..

4 0

3 years ago