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3 years ago

What is 4(-2) - 2y =8?

Mathematics

2 answers:

vladimir1956 [14]3 years ago

7 0

Answer:

y=-8

Step-by-step explanation:

Remember PEMDAS (Parentheses/Exponents/Multiplication/Division/Adding/Subtracting)

Multiply 4 and -2= -8

-8-2y=8

Now do inverse operations

to get rid of the -8 you add it to the other side = -2y=16

Then to get rid of the -2 you divide it out to get the y by it self to get y=-8

nlexa [21]3 years ago

5 0

Answer:

y=-8

Step-by-step explanation:

Step 1) distribute 4(-2)

-8-2y=8

Step 2) add 8 to both sides

-2y=16

Step 3) divide both sides by -2

y=-8

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anastassius [24]

Answer:

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3 years ago

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Blababa [14]

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3 years ago

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12x5 – 10x2 + x – 45

qaws [65]

(a)
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3 years ago

Help please -19 + 2z = -21

777dan777 [17]

Answer:

z = -1

Step-by-step explanation:

You must first start out by adding 19 to both sides to isolate the variable z, which results in:

2z = -2

Now, you can just divide by two on both sides to get z completely on its own, which gives you:

z = -1

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2 years ago

Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. Th

Pepsi [2]

Answer:

Step-by-step explanation:

a) The formula for determining the confidence interval for the difference of two population means is expressed as

Confidence interval = (x1 - x2) ± z√(s²/n1 + s2²/n2)

Where

x1 = sample mean of group 1

x2 = sample mean of group 2

s1 = sample standard deviation for data 1

s2 = sample standard deviation for data 2

For a 90% confidence interval, the z score is 1.645

From the information given,

x1 = 24.5

s1 = 4.3

n1 = 200

x2 = 16.3

s2 = 3.1

n2 = 200

x1 - x2 = 24.5 - 16.3 = 8.2

z√(s1²/n1 + s2²/n2) = 1.645√(4.3²/200 + 3.1²/200) = 1.645√0.1405

z = 0.62

Therefore, the 90% confidence interval is 8.2 ± 0.62

Interpretation:

B.The researchers are 90% confident that the difference of the means is in the interval.

b) B.Since the 90% confidence interval does not contain zero, the results suggest that priming does have an effect on scores.

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3 years ago