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Kitty [74]
4 years ago
3

Which is an unreliable source? A scientist who studies dinosaurs presents her research on velociraptors at a science convention.

An advertisement for acne medication claims it can clear up acne in less than one week. An article on the Centers for Disease Control and Prevention (CDC) website discusses the salmonella bacteria. A chemistry teacher discusses possible projects for the upcoming science fair.
Physics
1 answer:
Mashcka [7]4 years ago
8 0

Answer:

An advertisement for acne medication that claims it can clear up acne in less than one week is unreliable

Explanation:

The company wants to sell their product, so they will exaggerate or lie about how effective a product is; they are biased

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In some cases, neither of the two equations in the system will contain a variable with a coefficient of 1, so we must take a fur
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D = -4/7 = - 0.57

C = 17/7 = 2.43

Explanation:

We have the following two equations:

3C + 4D = 5\ --------------- eqn (1)\\2C + 5D = 2\ --------------- eqn (2)

First, we isolate C from equation (2):

2C + 5D = 2\\2C = 2 - 5D\\C = \frac{2 - 5D}{2}\ -------------- eqn(3)

using this value of C from equation (3) in equation (1):

3(\frac{2-5D}{2}) + 4D = 5\\\\\frac{6-15D}{2} + 4D = 5\\\\\frac{6-15D+8D}{2} = 5\\\\6-7D = (5)(2)\\7D = 6-10\\\\D = -\frac{4}{7}

<u>D = - 0.57</u>

Put this value in equation (3), we get:

C = \frac{2-(5)(\frac{-4}{7} )}{2}\\\\C = \frac{\frac{14+20}{7}}{2}\\\\C = \frac{34}{(7)(2)}\\\\C =  \frac{17}{7}\\

<u>C = 2.43</u>

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good luck

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