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guajiro [1.7K]
3 years ago
8

Which option below best describes the difference between an experiment and an observational study?

Mathematics
1 answer:
noname [10]3 years ago
5 0

An observation study is where nothing changes and you record what is seen. An experimental study you have a control group and a testable group.

The answer would be: .C. The groups in an experiment are chosen at random, but not in an observational study.

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Find the value of x.<br> to<br> 4<br> 42°<br> 60°<br> -
nata0808 [166]

Answer:

Step-by-step explanation:

The missing angle of the triangle is 180°-42°-60° = 78°.

x° =  180°-78° = 102°

3 0
3 years ago
Rewrite the quadratic function in intercept or factored form<br> y=-40x+2x^2-2x
poizon [28]

Answer:

y = 2x(x - 21)

Step-by-step explanation:

The given quadratic function y = -40x + 2x^2 - 2x

This can be rearranged as

y = 2x^2 - 2x - 40x

Here the Greatest Common Factor is 2x, we can take it out and write the remaining term in parenthesis.

y = 2x(x - 1 -20)

y = 2x(x - 21)

That's the answer.

Hope this will helpful.

Thank you.

4 0
2 years ago
Solve:........................<br><img src="https://tex.z-dn.net/?f=%20%5Cfrac%7Bx%7D%7B3%7D%20%20%2B%204%20%3D%20%20%5Cfrac%7B4
lakkis [162]

Answer:

\frac{x}{3}  + 4 =  \frac{4x - 1}{5}  \\  \\  \frac{x}{3}  +  \frac{12}{3}  =  \frac{4x - 1}{5}  \\  \\  \frac{x + 12}{3}  =  \frac{4x - 1}{5}  \\  \\ 3(4x - 1) = 5(x + 12) \\  \\ 12x - 3 = 5x + 60 \\  \\ 12x - 5x = 60 + 3 \\  \\ 7x = 63 \\  \\ x =  \frac{63}{7}  \\  \\ x = 9

7 0
2 years ago
Please solve this question withvfull process i will wark as braineast a) After allowing 5 % discount on the marked price of a ra
schepotkina [342]

Answer:

Let the marked price be x

Discount % = 10%

Discount = 10\% \times x = 0.1x10%×x=0.1x

Cost after discount = x-0.1x = 0.9x

10%vat is charged on it

Cost including VAT = 0.9x+0.1(0.9x)=0.99x0.9x+0.1(0.9x)=0.99x

We are given that  it's price became rs 1672

So, 0.99x = 1672

x=\frac{1672}{0.99}x=0.991672

x=1688.88

Discount = 0.1x=0.1(1688.88)=168.888

Hence The discount

7 0
3 years ago
Please you can help me with this problem. Thanks.
Galina-37 [17]

L= 1/8
O=1/4
C=1/8
H=1/8
S=1/8
O or L=3/8
S or C=1/4
S or C or O=1/2
OR mean to add.

5 0
3 years ago
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