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3 years ago

How to solve this problem

Mathematics

1 answer:

Arisa [49]3 years ago

4 0

First, you solve the square root:

$9+ \sqrt{-4}$

Knowing that the square root of a negative number doesn't exist:

$9+ \sqrt{-4}$
$9+2i$ is your answer.

Hope it helped,

Happy homework/ study/ exam!

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The product of a number and 7, decreased by the number is equal to 42. find the number.

lozanna [386]

Let the number be x.
7x-x=42
6x=42
x=7
the number is 7

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2 years ago

Pls helpppp I give brainliest <3

Pavel [41]

Answer:

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Step-by-step explanation:

The recipe serves 8 people, so to figure out how much you need to serve 32 people you multiply each measurment by 4 because 8 x 4=32.

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2 years ago

Tell whether the sequence is arithmetic. Justify your answer. If the sequence is arithmetic, write a recursive

navik [9.2K]

Answer:

The explicit formula

$a_n = 3 +0.25 (n-1)$

The recursive formula

$a_1 = 3$ for $n=1$

$a_n = a_ {(n-1)} +0.25$ if $n>1$

Step-by-step explanation:

If a sequence is arithmetical then the difference between any of its consecutive terms will be constant

3, 3.25, 3.5, 3.75,

$3.25-3 = 0.25\\\\3.5-3.25 = 0.25\\\\3.75 -3.5 = 0.25$

The difference between the consecutive terms remains constant so the sequence is arithmetic.

The explicit formula for an arithmetic sequence is:

$a_n = a_1 + d (n-1)$

Where d is the constant difference between the terms.

$d = 0.25$

$a_1$ is the first term of the sequence.

$a_1 = 3$

$a_n = 3 +0.25 (n-1)$

Finally, the recursive formula is:

$a_1 = 3\\\\a_n = a_ {(n-1)} +0.25$

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2 years ago

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astraxan [27]

Answer: The answer is D

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3 years ago

Assume that adults have IQ scores that are normally distributed with a mean of 101.3 and a standard deviation 19.9. Find the fir

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Answer:

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Use a calculator or table to find the z-score that corresponds to 25%.

P(Z < z) = 0.25

z = -0.675

Now find the value that corresponds to that z score.

z = (x − μ) / σ

-0.675 = (x − 101.3) / 19.9

x = 87.9

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3 years ago