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Diano4ka-milaya [45]
3 years ago
8

I’ll mark you brainlist I’ll mark you brainlist

Mathematics
2 answers:
Basile [38]3 years ago
8 0

Answer: undefined

Step by step explaination:

user100 [1]3 years ago
5 0

Answer:

Undefined

Step-by-step explanation:

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4.2z + 3.8z simplify the expression ​(Use the operation symbols in the math palette as needed. Simplify your answer. Use whole n
alexandr1967 [171]

Answer:

8z

Step-by-step explanation:

Since these are like terms, add the numbers together and then put the z on.

4 0
3 years ago
On a standard IQ test, the standard deviation is 15. How many random IQ scores must be obtained if we want to find the true popu
igor_vitrenko [27]

Answer:

We need at least 4238 scores.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1-0.97}{2} = 0.015

Now, we have to find z in the Ztable as such z has a pvalue of 1-\alpha.

So it is z with a pvalue of 1-0.015 = 0.985, so z = 2.17

Now, find the margin of error M

M = z*\frac{\sigma}{\sqrt{n}}

In which \sigma is the standard deviation of the population and n is the size of the sample.

How many random IQ scores must be obtained if we want to find the true population mean (with an allowable error of 0.5) and we want 97 percent confidence in the results

We need at least n scores, in which N is found when M = 0.5. So

M = z*\frac{\sigma}{\sqrt{n}}

0.5 = 2.17*\frac{15}{\sqrt{n}}

0.5\sqrt{n} = 2.17*15

0.5\sqrt{n} = 32.55

\sqrt{n} = \frac{32.55}{0.5}

\sqrt{n} = 65.1

\sqrt{n}^{2} = (65.1)^{2}

n = 4238

We need at least 4238 scores.

7 0
4 years ago
When Alice went to the print shop, she was confronted with many choices of sizes: 7-inch by 9-inch, 8-inch by 10-inch, and 12-in
Alex

Answer:

12-inch by 16-inch- it's the largest available and can be reduced to scale for smaller photos.

Step-by-step explanation:

-Given the dimensions 7-inch by 9-inch, 8-inch by 10-inch, and 12-inch by 16-inch:

#If Alice buys 7-inch by 9-inch and the photo turn's out to be a 8-inch by 10-inch or 12-inch by 16-inch then part of her photo will be cut off.

Hence, Don't buy.

#If Alice buys 8-inch by 10-inch and the photo turn's out to be a 12-inch by 16-inch then part of her photo will be cut off. However, if the photo is a 7-inch by 9-inch then it will fit.

Hence, don't buy.

#If Alice buys a  12-inch by 16-inch and the photo turns out to be smaller than expected the she can always print it out and trim or reduce the to scale excessive print paper to the desire dimensions.

Hence, buy  the 12-inch by 16-inch since it's the largest available and can be reduced to scale for smaller photos.

5 0
4 years ago
Antonio works at a grocery store. He puts 23 pounds of flour into 5 sacks. He put the same weight of flour into each sack. How m
Igoryamba
Antonio put 4.6 pounds of flower into each stack since 23 pounds divided by 5 stacks is 4.6
8 0
3 years ago
In △ABD, altitude AC¯¯¯¯¯ intersects the right angle of triangle ABD at vertex A. BC=3.1 in. and CD=7.2 in..
vodomira [7]

Answer:

4.72 in.

Step-by-step explanation:

BC = 3.1 in.

CD = 7.2 in.

Altitude of right triangle altitude is given as h = \sqrt{xy}, where:

h = altitude

x = 3.1 in.

y = 7.2 in.

Plug in the values into the formula

h = \sqrt{3.1*7.2}

h = \sqrt{22.32}

h = 4.72 in. (nearest hundred)

5 0
3 years ago
Read 2 more answers
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