10 students averaged 80, so the sum of their scores was (10 x 80) = 800
20 students averaged 89, so the sum of their scores was (20 x 89) = 1,780
All together, the sum of all 30 scores was (800 + 1,780) = 2,580
30 students totaled 2,580, so their average was (2,580 / 30) = <em> 86</em> .
Answer:
-7
Step-by-step explanation:
30-16= -5n +3n
14 = -2n
multiplying both by half,u have -
7 = -n
multiply both by -1
7 = n
Answer:
Step-by-step explanation:
( 
, 
)
( 
, 
)
m = 
parallel lines have the same slopes , perpendicular lines have slope which are opposite reciprocals.
~~~~~~~~~~~~~~~
A( 3 , 5 )
B( - 2 , 7 )
= 
= - 
C( 10 , 5 )
D( 6 , 15 )
= 
= - 
The answer is (A) Neither
Answer:
Hello There!!
Step-by-step explanation:
I think the answer is B. The probability of not drawing a club or jack from a deck of cards.
hope this helps,have a great day!!
~Pinky~
