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3 years ago

Simplify the expression (2j+1)(2)

Mathematics

2 answers:

stiks02 [169]3 years ago

6 0

Answer:

4j + 2

Step-by-step explanation:

Distribute:

(2j * 2) + (1 * 2)

4j + 2

n200080 [17]3 years ago

6 0

When you simplify the equation, it would be 4j+2

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3 years ago

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3 years ago

Which exponential expression is equal to 2−5·28

gizmo_the_mogwai [7]

Answer:

Impossible

Step-by-step explanation:

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3 years ago

One sample has Aa Aa One sample has n 10 scores and a variance of s2 20, and a second sample has n 15 scores and a variance of s

siniylev [52]

Answer:

option (a) It will be closer to 30 than to 20

Step-by-step explanation:

Data provided in the question:

For sample 1:

n₁ = 10

variance, s₁² = 20

For sample 2:

n₂ = 15

variance, s₂² = 30

Now,

The pooled variance is calculated using the formula,

$S^{2}_{p} = \frac{(n_{1}-1)\times s^{2}_{1} +(n_{2}-1)\times s^{2}_{2}}{n_{1}+n_{2}-2}$

on substituting the given respective values, we get

$S^{2}_{p} = \frac{(10-1)\times 20 +(15-1)\times 30}{10+15-2}$

$S^{2}_{p}$ = 26.0869

Hence,

the pooled variance will be closer to 30 than to 20

Therefore,

The correct answer is option (a) It will be closer to 30 than to 20

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2 years ago