Answer:
3/7 and 4/14
Step-by-step explanation:
a) 3/7 is not an equivalent of 6/21 because when you multiply the numerator and the denominator by 2 you get: 6/14
b) 4/14 is not an equivalent
Answer:
There is no common difference
Step-by-step explanation:
4 9 13 18
diff 5 4 5
Because the difference between 9 and 13 is 4
and the difference in the other terms is 5
there is no common differeence
Answer:
50 degrees
Step-by-step explanation:
PLZ MARK BRAINLIEST
646 is 190% of 340
Simply do the following,
1) divide,

2) multiply the above answer by 100

3) dock on that percent sign,

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I hope that helps you out!!
Any more questions, please just ask me!!
~ Zoey
Answer:
Options B and D.
Step-by-step explanation:
The general form of sine function

where, |A| is amplitude,
is period,
is phase shift and D is y-intercept.
The general form of cosine function

where, |A| is amplitude,
is period,
is phase shift and D is y-intercept.
In function, 
Amplitude : 
y-intercept : -1
In function, 
Amplitude : 
y-intercept : -1
In function, 
Amplitude : 
y-intercept : 0
In function, 
Amplitude : 
y-intercept : -1
Therefore, the correct options are B and D.