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3 years ago

Choose the correct definition of an experiment from the choices below.

Mathematics

1 answer:

miss Akunina [59]3 years ago

6 0

Answer:

4. A study where subjects are given treatments and their responses are measured and recorded.

Step-by-step explanation:

The correct answer is - 4. A study where subjects are given treatments and their responses are measured and recorded.

Reason -

An EXPERIMENT is any activity with an observable result.

Here,

Responses are measured and then recorded.

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Is 2x+4+3(2x-1) equivalent to 8x-2

almond37 [142]

Answer: 2x+4+3(2x-1) is not equivalent to 8x-2. it is equivalent to 8x+1

Step by step solution:

Step 1 :

Equation at the end of step 1 :

(2x + 4) + 3 • (2x - 1)

Step 2 :

Final result :

8x + 1

3 0

4 years ago

What is 2.4×10 to the seventh power

kotykmax [81]

This is easy once you look at it you just have to move the decimal 7 places and you'll get 24,000,000

8 0

3 years ago

Given f (x) = 3x + 4, find f (2).

stealth61 [152]

$f(2) = 3 \cdot 2 + 4 = 6 + 4 = 10$

8 0

3 years ago

Will mark brainliest! Questions are in the picture!

alexdok [17]

Answer:

52.9 inches .

Step-by-step explanation:

Given that the triangular indentation has an area of 100 in.² and the base and height of this traingle are represented by expressions 3x and x+3 respectively . We need to find out the perimeter to the nearest tenth.

As we know that the area of triangle is ,

$\rm\longrightarrow Area_{\triangle}=\dfrac{1}{2}(base)(height)$

Substituting the respective values,

$\rm\longrightarrow 100\ =\dfrac{1}{2}(x+3)(3x)\\\\\rm\longrightarrow 2(100) = 3x(x+3)\\\\\rm\longrightarrow200 = 3x^2+9x\\\\\rm\longrightarrow 3x^2+9x-200=0$

On using the Quadratic formula , we have;

$\rm\longrightarrow x =\dfrac{-9\pm\sqrt{9^2-4(3)(-200)}}{2(3)} \\\\\rm\longrightarrow x =\dfrac{-9\pm \sqrt{81+1200}}{6}\\\\\rm\longrightarrow x =\dfrac{-9\pm \sqrt{1281}}{6}$

On simplifying above , we will get ,

$\rm\longrightarrow x = 6.802,-9.802$

Since sides can't be negative, therefore,

$\rm\longrightarrow\underline{\underline{ x =6.802}}$

Therefore ,

$\rm\longrightarrow Base = 3x =3(6.802)in = 20.406\ in\\$
$\rm\longrightarrow Height = x +3=6.802+3=9.802\ in$

Next let's find out the hypotenuse using Pythagoras theorem, as ;

$\rm\longrightarrow h=\sqrt{ b^2+p^2}\\$

$\rm\longrightarrow h =\sqrt{ (20.406)^2+(9.802)^2}\\$

$\rm\longrightarrow h =\sqrt{416.40+96.07}\\$

$\rm\longrightarrow h = 22.63\ in$

Now we may find perimeter as ,

$\rm\longrightarrow P = p + b + h \\$

$\rm\longrightarrow P = (22.63 + 9.802 + 20.406)in.$

$\\\rm\longrightarrow P = 52.89 \ in.\\$

$\rm\longrightarrow \underline{\underline{ Perimeter = 52.9\ in .}}$

8 0

3 years ago

Help me pls and show me how u did it their is no graph so how would I do this algebraically

Ahat [919]

Subtract 4 from both sides

y−4>−2x
Divide both sides by -2

x>-y-4/2

Question 2 - y>x-4

Add 4 to both sides

y+4>x

Switch sides

x<y+4

8 0

4 years ago