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kow [346]
3 years ago
7

When evaluating an observational study, the four factors that should be reviewed are

Mathematics
1 answer:
Zinaida [17]3 years ago
7 0
They are
1. Background
2. Methods
3. Results
4. Conclusions
Hope this helped
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Find the area of the right triangle △DEF with the points D (0, 0), E (1, 1), and F.
Tems11 [23]

Answer:

The area of the triangle is  \sqrt{3}

Step-by-step explanation:

Given:

Coordinates D (0, 0), E (1, 1)

Angle  ∠DEF = 60°

△DEF is a Right triangle

To Find:

The area of the triangle

Solution:

The area of the triangle is  = \frac{1}{2}(base \times height)

Here the base is Distance between D and E

calculation the distance using the distance formula, we get

DE  = \sqrt{(0-1)^2 + (0-1)^2}

DE =\sqrt{(-1) ^2 + (-1)^2

DE = \sqrt{1+1}

DE = \sqrt{2}

Base = \sqrt{2}

Height is DF

DF =tan(60^{\circ}) \times DE

DF = \sqrt{3} \times DE

DF = \sqrt{3} \times\sqrt{2}

Now, the area of the triangle is

= \frac{1}{2}({\sqrt{2})(\sqrt{3} \times \sqrt{2})

=\frac{1}{2}({\sqrt{2})(\sqrt{3} \sqrt{2})

=\frac{1}{2}(2\sqrt{3} )

=\sqrt{3}

6 0
3 years ago
Simplify (-2)^-3<br> a. -8<br> b. -1/8<br> c. 1/8<br> d. 8
dusya [7]

Answer:

Its D because 2×2×2 equals 8 and they are both minus and knowing - times - makes + so it becomes 8

7 0
3 years ago
Read 2 more answers
PLEASE HELP ill give brainlist to the first right answer
attashe74 [19]

Answer:

Step-by-step explanation:

Put it into y=mx+b form and use substitution.

3 0
3 years ago
13x12=[3x______]+[3x_____]+[10 x______]+[10x____]
Ray Of Light [21]

Answer:it's on the explanation

Step-by-step explanation:

3 x 1

3 x 1

10 x 5

10 x 9

6 0
3 years ago
13/20 as a percent and 7/25 as a percent to no need to show work just need the straight up percent
Ivahew [28]
13/20 = 65%
7/25 = 28%
4 0
3 years ago
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