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2 years ago

Please help me with this homework

Mathematics

1 answer:

yulyashka [42]2 years ago

7 0

I disagree. The first one is false. No exponent rules apply if the bases AND the exponents are different.

The second one is true. Bases are the sane so you add exponents. You get 3 to the -5 power. Written with positive exponents it’s 1/3 to the 5.

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Find the product. (6a + 3b)(a - b) Enter the correct answer.

Musya8 [376]

Answer:

See below.

Step-by-step explanation:

$(6a+3b)(a-b)\\$

Distribute:

$=(6a+3b)(a)-(6a+3b)(b)\\=6a^2+3ab-(6ab+3b^2)\\=6a^2+3ab-6ab-3b^2\\=6a^2-3b^2-3ab$

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2 years ago

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Your answer would be 0.

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2 years ago

Given the points (-2,-4) and (-3,-5) what is the slope

Dahasolnce [82]

Answer:

1/1

Step-by-step explanation:

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2 years ago

A _______ represents the idea of "if and only if." Its symbol is a double arrow, left right arrow↔.

Bond [772]

Answer:

A bi-conditional statement represents the idea of "if and only if." Its symbol is a $\leftrightarrow$ .

Step-by-step explanation:

We have been given an incomplete sentence. We are supposed to fill in the given blank.

A _______ represents the idea of "if and only if." Its symbol is a $\leftrightarrow$ .

We know that "if and only if" stands for bi-conditional statement, which represents either both statements are true or both are false.

The symbol $\leftrightarrow$ represent a bi-conditional statement.

Therefore, our complete statement would be: A bi-conditional statement represents the idea of "if and only if." Its symbol is a $\leftrightarrow$ .

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3 years ago

Some IQ tests are standardized to a Normal model N(100,19). What is the cutoff value for the top 5% of all IQs

Montano1993 [528]

Answer:

The cutoff value for the top 5% of all IQs is 131.255.

Step-by-step explanation:

When the distribution is normal, we use the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this question, we have that:

$\mu = 100, \sigma = 19$