What is 1/2x+1.5-2-7 simplified

Please help me I will give brainly

Nezavi [6.7K]

Answer:

B

Step-by-step explanation:

6 0

3 years ago

The average gasoline price of one of the major oil companies in Europe has been $1.25 per liter. Recently, the company has under

umka2103 [35]

Answer:

1. Option A) Reject the null hypothesis

2. Option B) 0.0062

Step-by-step explanation:

We are given the following in the question:

1. Population mean, μ = $1.25 per liter

Sample mean, $\bar{x}$ = $1.20 per lite

Sample size, n = 49

Alpha, α = 0.05

Population standard deviation, σ = $0.14

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 1.25\text{ dollars per liter}\\H_A: \mu < 1.25\text{ dollars per liter}$

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

$z_{stat} = \displaystyle\frac{1.20 - 1.25}{\frac{0.14}{\sqrt{49}}}= -2.5$

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

Since,

$z_{stat} < z_{critical}$

We reject the null hypothesis and accept the alternate hypothesis.

Option A) Reject the null hypothesis

Thus, there is enough evidence to support the claim that efficiency measures have reduced the prices.

2. We can calculate the p value from the standard table.

P-value = 0.0062

Option B) 0.0062

4 0

3 years ago

Plz help and have a correct answer! everyone is wrong...will mark brainliest!

Ludmilka [50]

Answer:

11) The intersection of two sets is the set of the elements that are common for both sets, in this case, we can see that: 79, 83 and 99 appear in both sets, then the intersection is: {79, 83, 99}

12) the union of both sets (all the possible options in the selection) is:

{75, 79, 82, 83, 94, 99, 101, 105} and the intersection set is {79, 83, 99}

So we have 8 elements in total, and 3 of them belong to the intersection, then the probability of selecting at random one element that belongs in the intersection is:

p = 3/8 = 0.375

13) In this case, the universal set is the set of all the real numbers.

You can remember that the set of all real numbers is equal to the union of the sets of the rational numbers and the set of the irrational numbers (and those two sets do not share any element).

Then, if we have only the set A = set of the irrational numbers, the complement will be the set of the rational numbers, because we must have that:

Set A U complement = Real set = irrational U rational.

(where U stands for "union")

now we replace Set A = irrational.

Irrational U complement = irrational U rational

complement = rational.

3 0

3 years ago

What is the approximate value of Log Subscript 6 Baseline 25? 0.233 0.557 0.620 1.796

Sedaia [141]

Answer:

D. on edge

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

HELP PLZ<br><br><br> What is the expression in simple radical form?

Wittaler [7]

Answer: 18.52

Step-by-step explanation: not exactly sure if this is right. Had to look it up sorry. (Link=https://www.mathwarehouse.com/arithmetic/square-root-calculator.php)

343−−−√49⋅7−−−−√ 49−−√7–√ 77–√

343−−−√≈18.520259177452136

3 0

4 years ago