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3 years ago

Simplify by combining like terms: 2x + 3x + 7

Mathematics

2 answers:

DaniilM [7]3 years ago

7 0

Answer: 5x+7

Step-by-step explanation:

2x+3x+7

5x+7

vesna_86 [32]3 years ago

5 0

Answer:

$\boxed{ \bold{ \huge{ \boxed{ \sf{5x + 7}}}}}$

Step-by-step explanation:

$\sf{2x + 3x + 7}$

Like terms are those which have the same base.Only the coefficients of like terms can be added or subtracted

$\longrightarrow{ \sf{5x + 7}}$

Hope I helped!

Best regards! :D

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3 years ago

A certain standardized test's math scores have a bell-shaped distribution with a mean of 530 and a standard deviation of 119. Co

kumpel [21]

Answer:

a) 68.2%

b) 31.8%

c) 2.3%

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 530

Standard Deviation, σ = 119

We are given that the distribution of math scores is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

a) P(test scores is between 411 and 649)

$P(411 \leq x \leq 649)\\\\= P(\displaystyle\frac{411 - 530}{119} \leq z \leq \displaystyle\frac{649-530}{119})\\\\= P(-1 \leq z \leq 1)\\\\= P(z \leq 1) - P(z < -1)\\= 0.841 - 0.159 = 0.682 = 68.2\%$

b) P(scores is less than 411 or greater than 649)

$P(x < 411 < x, x > 649)\\=1 = P(411 \leq x \leq 649)\\=1 - 0.682\\=0.318 = 31.8\%$

c) P(score greater than 768)

P(x > 768)

$P( x > 768) = P( z > \displaystyle\frac{768 - 530}{119}) = P(z > 2)$

$= 1 - P(z \leq 2)$

Calculation the value from standard normal z table, we have,

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3 years ago

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hammer [34]

Answer:

The answer is 10.

Step-by-step explanation:

There would be 10 players, 2 for each group, and if each player played every other player twice, then that would mean that 20 matches of chess were played.

Hope this helped!! (:

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3 years ago

What is 4.236 divided by 6

neonofarm [45]

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2 years ago

Simplify by combining like terms: 2x + 3x + 7​

Simplify by combining like terms: 2x + 3x + 7