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3 years ago

Help me! I'm not good at maths!!!

Mathematics

1 answer:

meriva3 years ago

4 0

Answer: -1

Raising one exponential expression to another exponent means you multiply the exponents together. We have 5*5 = 25 as the new exponent.

So we end up with (-1)^25 = -1

The rule I'm using is that -1 to any odd whole number power is going to result in -1. If the exponent was even, then -1 to that power would be 1.

So in short, the rule says

(-1)^n = -1 if n is an odd whole number

(-1)^n = 1 if n is an even whole number

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n200080 [17]

Answer: where is the question??

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2 years ago

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In order to determine an interval for the mean of a population with unknown standard deviation, a sample of 24 items is selected

nikitadnepr [17]

If the sample size of population is 24 then the number of degrees of freedom for reading the t value is 23 which is option c.

Given sample size of 24,mean 23.

We have to determine the number of degrees of freedom which will be used to find the critical values of t.

Degree of freedom is the number of values in the final calculation of a statistic that are free to vary means that can change their values in the formula of calculating t.

t=(X-μ)/s/ $\sqrt{n}$

where X is sample mean ,

μ is hypothsised population mean

s is sample standard deviation

n is sample size.

Degree of freedom=n-1

In this question n is 24 so the degree of freedom =24-1=23.

Hence the number of degrees of freedom for reading the t value is 23.

Learn more about degree of freedom at brainly.com/question/17305237

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2 years ago

Can you please help me olve theses

Mashcka [7]

<h3>Answer:</h3>

$f(x) = 0 \text{ when } x = \bold{1}$

$f(-7) =\bold{224}$

<h3>Step-by-step explanation:</h3>

Solving for the input, $\bold{x}$ , given the output:

Given:

$f(x) = 4x -4$

Solving for $x$ from the equation, $f(x) = 0$ :

$f(x) = 0 \\ 4x -4 = 0 \\ 4x = 4 \\ x = \frac{4}{4} \\ x = 1$

Solving for the output, $\bold{f(x)}$ , given the input.

Given:

$f(x) = 4x^2 -4x$

Solving $f(-7)$ :

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3 years ago

Percy has $50 in a savings account. The interest rate is 10% per year and is not compounded. How much will he have in 1 year?

user100 [1]

Answer:

Step-by-step explanation:

Take the 50 and multiply by 1.1 (this is 10% if you dont want to go .1 and add that to 50)

50*1.1=x

50*1.1=55

There will be a total of 55 Dollars in the savings account. He has earned 5 dollars in interest.

Hope This helps :)

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2 years ago

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ANTONII [103]

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Step-by-step explanation:

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