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3 years ago

A double-blind experiment is used to increase the placebo effect. True or false

Mathematics

1 answer:

Alexus [3.1K]3 years ago

4 0

Answer:

True.

Step-by-step explanation:

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PLEASE HELP

irina [24]

Take the longer leg length as $x$

$(x-8)^2+x^2=(x+8)^2 \\ \\ x^2-16x+64+x^2=x^2+16x+64 \\ \\ x^2-32x=0$

Use the formular
$x={ \frac{-b+ \sqrt{ b^2-4ac}}{2a} } \\ \\ x={ \frac{32+32}{2} } \\ \\ x=32$

∴ shorter leg = 32 - 8 = 24ft
longer leg = 32ft
hypotenuse = 32 + 8 = 40ft

8 0

3 years ago

Which choice is equivalent to the product below? √3 × √5 × √6

Maslowich

Answer:

Step-by-step explanation:

8 0

3 years ago

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The Quadratic Formula, x equals negative b plus or minus the square root of b squared minus 4 times a times c, all over 2 times

DedPeter [7]

Answer:

The correct option is 2 .

Therefore ,the missing denominator of the solution. 4 plus or minus the square root of 2, all over is  2 . 

$x=\dfrac{4\pm\sqrt{2}}{2}$

Step-by-step explanation:

For a Quadratic Equation ax² + bx + c = 0

By Formula Method we get

$x=\dfrac{-b\pm\sqrt{b^{2}-4ac}}{2a}$

So we have Quadratic Equation is 2x² - 8x + 7 = 0

On Comparing we get

$a=2\\b=-8\\c=7$

Substituting a , b, c values we get

$x=\dfrac{-(-8)\pm\sqrt{(-8)^{2}-4(2)(7)}}{2(2)}\\\\x=\dfrac{8\pm\sqrt{64-56}}{4}\\\\x=\dfrac{8\pm\sqrt{8}}{4}\\\\x=\dfrac{8\pm2\sqrt{2}}{4}\\\\x=2(\dfrac{4\pm\sqrt{2}}{4})\\\\x=\dfrac{4\pm\sqrt{2}}{2}$

Therefore ,the missing denominator of the solution. 4 plus or minus the square root of 2, all over is  2 . 

7 0

3 years ago

Ethan is 40 years old. His son is 12 years old. How many years ago was Ethan 5 times older than his son?

ella [17]

X=number of years that Ethas was 5 times older than his son.
we suggest this equation:

40-x=5(12-x)
40-x=60-5x
-x+5x=60-40
4x=20
x=20/4=5

answer. 5 years.

8 0

3 years ago

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Select the graph that matches the function y= 3x + 7

Molodets [167]

Answer:

The first graph.

Step-by-step explanation:

The graph of the function y = 2x + 7, is a straight line because it is a linear function, and has y-intercept of 7 and a slope of 3; so we are looking for a graph that has these characteristics.

From the 4 graphs, we see that the 1st graph has a slope of 3 and a y intercept of 7, and thus it is the correct answer.

4 0

3 years ago

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