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2 years ago

7

A study found that there is no direct relationship between the time that 8th-grade students spend brushing their teeth and their

final math grade for the year.
What is the association?
A.) decreasing
B.) no association
C.) increasing

2 answers:

Licemer1 [7]2 years ago

5 0

Answer:

B.) no association

Step-by-step explanation:

D-umb study

gregori [183]2 years ago

5 0

Answer:

b no association

Step-by-step explanation:

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Sin(60-theta)sin(60+theta)

ehidna [41]

Step-by-step explanation:

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from difference of two squares:

${ \boxed{(a - b)(a + b) = ( {a}^{2} - {b}^{2} ) }}$

therefore:

$= \{ {( \frac{ \sqrt{3} }{2}) }^{2} { \cos }^{2} \theta \} - \{ {( \frac{ \sqrt{3} }{2} )}^{2} { \sin }^{2} \theta \} \\ \\ = \frac{3}{4} { \cos }^{2} \theta - \frac{3}{4} { \sin}^{2} \theta$

factorise out ¾ :

$= \frac{3}{4} ( { \cos }^{2} \theta - { \sin}^{2} \theta) \\ \\ = { \boxed{ \frac{3}{4} \cos(2 \theta) }}$

3 0

3 years ago

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What is 9/14 x 2 1/3!!!!

pshichka [43]

The answer is 11
Explaination:
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Break 2 1/3 into 2 and 1/3
1/3 multiple both numbers but 14=14/42
27/42 x 14/42 keep number on the bottom the same
27x14= 378
Divide 378/42=9
Add the 2 from 2 1/3 to the nine
2+9=11

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2 years ago

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ANEK [815]

Answer:

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Step-by-step explanation:

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Serggg [28]

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