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SIZIF [17.4K]
3 years ago
6

Find the product mentally.

Mathematics
2 answers:
BigorU [14]3 years ago
3 0
I don't understand what you mean by 'mentally' but anyways, here is how to solve it.

(z−12)(z+12)

=(z+−12)(z+12)

=(z)(z)+(z)(12)+(−12)(z)+(−12)(12)

=z^2+12z−12z−144

=z^2−144

Dima020 [189]3 years ago
3 0
A.
thinking...
12^2=144
signs different therefore the 12 cancels out (no middle term)
signs different sign is negative

hope this helps
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Answer:1. uses a related sample - repeated measures

2. . does not use a related sample--a

Step-by-step explanation:

Question 1.

step1  A repeated measure design is a design which measures a given sample repeatedly over a given time using different conditions or related measures.

step 2:In the treatment for compulsive hoarding, Here, measures are taken two times ie before and after treatment on the same 50 hoarders which shows a repeated measure, also the design is a within related sample of the same 50 hoarders to give measurement at different conditions  of treatment for  high and low hoarding scores so the design describes  a related sample - repeated measures

Question 2:

step 1 ; An unrelated sample  occurs when Samples being measured do not depend on each other  

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Anna71 [15]

Answer:

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Step-by-step explanation:

Supplementary means that they add up to 180.

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x = 15 + 2y

The above equation comes from the information given, that it's 15 more than twice the smaller angle.

Now let's use substitution.

x + y = 180

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y = 55

The smaller angle is 55. Plug this back in to the first equation to get x.

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x + 55 = 180

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Now that you have both, test them again just to be sure that they fit the given conditions.

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x = 8

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