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4 years ago

Which situation is an example of an observational study?

Mathematics

1 answer:

stiks02 [169]4 years ago

8 0

Answer:

D.) Collecting the cholesterol readings of a group of people in a certain age group in a small town

Step-by-step explanation:

You might be interested in

Find the reflection of point (50, 25) across the x-axis.

serious [3.7K]

The reflection of any point across the x-axis:

⇒ means that x-coordinate remains the same

⇒ but the y-coordinate is multiplied by '-1'

In this case:

⇒ (50,25) becomes (50,-25)

Answer: (50,-25)

Hope that helps!

#LearnwithBrainly

6 0

2 years ago

Read 2 more answers

I need the solution

Nataly [62]

The only thing you can do here is to try to simplify, so I'll assume that's what you want to do.

$\dfrac{b^2-a^2}{2a^2+ab-3b^2}$

The numerator is a difference of squares, so it's easy to factorize:

$b^2-a^2=(b-a)(b+a)$

In the denominator, we factorize by grouping:

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

So we have

$\dfrac{b^2-a^2}{2a^2+ab-3b^2}=\dfrac{(b-a)(b+a)}{(2a+3b)(a-b)}=-\dfrac{b+a}{2a+3b}$

5 0

4 years ago

Please help ASAP!!!!!!

erica [24]

Answer:

300

Step-by-step explanation:

20*30=600

600/2=300

Please mark as Brainliest! :)

Have a nice day.

6 0

4 years ago

Jonathan’s class has 30 boys. Of the students in his class, 60% are girls. How many girls are in Jonathan’s class? 75 60 45 20

shutvik [7]

45 I think. I am not sure though, not the brightest one here.

6 0

3 years ago

Read 2 more answers

11/5 - 7/4 + 2/1 evaluate

irga5000 [103]

Step-by-step explanation:

11/5−7/4+2/1

=49/20(Decimal: 2.45)

4 0

3 years ago