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saul85 [17]
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
Mathematics
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:

\sin(60 -  \theta)  \sin(60 +  \theta)  \\  =  \{ \sin(60)  \cos( \theta)  -  \sin( \theta)   \cos(60)  \} \{ \sin(60)  \cos( \theta)  +  \cos(60)  \sin( \theta)  \} \\  =  \{ \frac{ \sqrt{3} }{2}  \cos( \theta)  -  \frac{1}{2}  \sin( \theta)  \} \{ \frac{ \sqrt{3} }{2}  \cos( \theta)  +  \frac{1}{2}  \sin( \theta)  \} \\  \\

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
Read 2 more answers
What is 9/14 x 2 1/3!!!!
pshichka [43]
The answer is 11
Explaination:
9/14 multiple both numbers by 3=27/42
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
8 0
2 years ago
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ANEK [815]

Answer:

5000

Step-by-step explanation:


6 0
3 years ago
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Determine if (-2,5) is a solution of Of 3x+4y=14
Serggg [28]
Well that's easy. Just plug in the numbers: 3*(-2)+4*(5)=14. So yes the solution is correct.
8 0
3 years ago
9. If 3/4 of a ton of sand covers 2/5 of a playground, how many tons of sand are required to cover the entire playground
Lynna [10]
1 7/8 tons of sand will be required to fill the playground

6 0
2 years ago
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