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2 years ago

Please help to write the following

Mathematics

2 answers:

11111nata11111 [884]2 years ago

7 0

Option 2 should be correct

Vanyuwa [196]2 years ago

4 0

Answer: option 2. x²-1

Step-by-step explanation:

concept to know: a²-b²=(a+b)(a-b)

------------

(a+b)(a-b)=a²+b²

(x+1)(x-1)=x²-1

Hope this helps!! :)

Please let me know if you have any question

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Trying to see what my answer would be

Oksanka [162]

Answer:

B. $2^{-14}*5^{10}$ .

Step-by-step explanation:

Use the power of a power property.

$(2^{-7}*5^{5} )^{2}$

Multiply all the exponents in the parenthesis by 2.

$(2^{-7}*5^{5} )^{2}=(2^{-14}*5^{10} )$

The answer is B. $2^{-14}*5^{10}$ .

Hope this helps!

7 0

1 year ago

6th grade math help me please :))

sergij07 [2.7K]

Answer:

The answer is option D.

3u + 1 + 7y

All the terms here are different and cannot be combined

Hope this helps you

4 0

3 years ago

Consider the following hypothesis test: H 0: 20 H a: < 20 A sample of 60 provided a sample mean of 19.5. The population stand

viva [34]

Answer:

We reject the null hypothesis and accept the alternate hypothesis. Thus, it be concluded that the population mean is less than 20.

Step-by-step explanation:

We are given the following in the question:

Population mean, μ = 60

Sample mean, $\bar{x}$ = 19.5

Sample size, n = 60

Alpha, α = 0.05

Population standard deviation, σ = 1.8

First, we design the null and the alternate hypothesis

$H_{0}: \mu = 20\\H_A: \mu < 20$

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

$z_{stat} = \displaystyle\frac{19.5 - 20}{\frac{1.8}{\sqrt{60}} } = -2.151$

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. Thus, it be concluded that the population mean is less than 20.

5 0

3 years ago

What is the first step in solving quadratic equations by finding square roots? a. give the positive and negative answer C. b. is

tangare [24]

The first step in solving quadratic equations by finding square roots is; C:square root both sides to isolate x

<h3>How to solve quadratic equations?</h3>

To answer this question, we will take an example of a quadratic equation that we need to find the square root as;

x² = 36

Now, to get the roots which are the values of x, we will first have to take the square root of both sides to Isolate x. Thus;

√x² = √36

x = ±6

Read more about quadratic equations at; brainly.com/question/1214333

#SPJ1

6 0

2 years ago

Which triangles are congruent

Anarel [89]

Answer:

I don’t see any triangles to tell you

Step-by-step explanation:

8 0

3 years ago