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3 years ago

10

1)

1 answer:

algol133 years ago

3 0

You will try all the cases and see if all the equations will match after substituting or no.
1.
5x
put x = 1/2
2.5 isn't equal to 20

4=15x
put x =1/2
15 × 1/3 =7.5
7.5 isn't equal to 4

-4x = 60
put x = 1/2
-4×1/2 = -2
-2 isn't equal to 60

30 = 60x
pit x = 1/2
60 × 1/2 = 30
30 = 30

Therefore, the correct answer is D. 30 = 60x

2. Answer is B. -4 , 4

Put x = -4
l 5 × -4 l = l-20l = 20
20 = 20

Put x = 4
l 5 × 4 l = l20l = 20
20 = 20

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4 years ago

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Trudy's father has a large collection of ties. He has 18 ties, and 2 of them are striped.

jenyasd209 [6]

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3 years ago

Please help me. Hurry, linear equations.

Lisa [10]

Answer:

Let's simplify step-by-step.

3−3/4x−1/4x−7

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3 years ago

What is the standard error of a sampling distribution with a population standard deviation of 12 and the sample size of 81?

Marizza181 [45]

Answer: d. 1.3333

Step-by-step explanation:

We know that the standard error of a sampling distribution is given by :-

$S.E.=\dfrac{\sigma}{\sqrt{n}}$

, where $\sigma$ = Population standard deviation.

n= Sample size.

AS per given , we have

$\sigma =12$

n=81

Then, the standard error of a sampling distribution with a population standard deviation of 12 and the sample size of 81 will be :-

$S.E.=\dfrac{12}{\sqrt{81}}$

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Thus the correct answer is d. 1.3333 .

6 0

3 years ago

X:y=5:3 and x+y=56 work ouy the value of x and y

emmainna [20.7K]

Answer:

x=35, y=21

Step-by-step explanation:

A way to rewrite the first equation is $\frac{x}{y} =\frac{5}{3}$

after cross-multiplying, we get 3x=5y.

If we solve for one variable, we can substitute it into the other equation.

Let's solve for x.

3x=5y

x=(5/3)y

Now, we can substitute x=(5/3)y in the equation x+y=56.

(5/3)y+y=56

(8/3)y=56

y=21

Going back to x+y=56, we can now plug back in y, knowing that it is 21.

x+21=56

x=35.

8 0

3 years ago