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3 years ago

Explain how you can tell if the expressions

Mathematics

2 answers:

Paha777 [63]3 years ago

5 0

Answer:

commutative property: the property stating that changing the order in which two numbers are added or multiplied does not change the value of the sum or product

equivalent: having the same amount, value, area, volume, or force

evaluate: to determine the value of

like terms: terms consisting of the same variables, raised to the same exponent

Step-by-step explanation:

dezoksy [38]3 years ago

3 0

Answer:

the expression is 9)+9(12=21

Step-by-step explanation:

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A recent study stated that if a person chewed gum, the average number of sticks of gum he or she chewed daily was 8. Researcher

konstantin123 [22]

Answer:

The average number of sticks of gum a person chewed daily was greater than 8.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 8

Sample mean, $\bar{x}$ = 9

Sample size, n = 36

Alpha, α = 0.05

Population standard deviation, σ = 1

First, we design the null and the alternate hypothesis

$H_{0}: \mu \leq 8\text{ gums}\\H_A: \mu > 8\text{ gums}$

We use one-tailed z test to perform this hypothesis.

Formula:

$z_{stat} = \displaystyle\frac{\bar{x} - \mu}{\frac{\sigma}{\sqrt{n}} }$

Putting all the values, we have

$z_{stat} = \displaystyle\frac{9 - 8}{\frac{1}{\sqrt{36}} } = 6$

Now, $z_{critical} \text{ at 0.05 level of significance } = 1.64$

Since,

$z_{stat} > z_{critical}$

We fail to accept the null hypothesis and reject the null hypothesis. We accept the alternate hypothesis.

Thus, the average number of sticks of gum a person chewed daily was greater than 8.

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Step-by-step explanation:

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