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Rudiy27
3 years ago
15

What expression is equivalent to 3(5+4)? A)15+12 B)15+4 C)8+7 D)8+4

Mathematics
2 answers:
valentina_108 [34]3 years ago
6 0

Answer:

A)15+12

hope it helps...

m_a_m_a [10]3 years ago
4 0
15+12

You need to distribute the 3 to the numbers inside the parentheses. 3*5=15, and 3*4=12. Therefore, it is equivalent to 15+12
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Read 2 more answers
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}

or

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

4 0
3 years ago
Need help quick!! <br> WILL GIVE BRAINLIEST
Murljashka [212]

Answer:

3 and 4 x=25, y=29

Step-by-step explanation:

If you need a step by step explanation, I will edit this later.

5 0
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How many members of the U.S. House of Representatives are supporting at least one of the two laws being debated?
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