Average (mean) = (sum of all the data) / (# of data)
sum of all the data = (average)(# of data)
Thus for 100 students with an average of 93,
sum of all data = (93)(100) = 9300
and for 300 students with an average of 75,
sum of all data = (75)(300) = 22500
Therefore you would expect the overall average to be
(9300 + 22500) / (100 + 300) = 79.5 %
Now if there are x # of advanced students and y # of regular students, then
x + y = 90 (total # of students) and 93x + 75y = 87(x + y) (overall average)
The second equation can be simplified to x - 2y = 0
Subtracting the two equations yields
x = 60 and y = 90
Therefore you would need 60 advanced and 30 regular students.
Pemdas
or
sadmep
it depends.
Parenthesis
exponents
multiplication
division
addition
Subtraction
<span>9x - 3 = -39
9x = -39 + 3
9x = -36
x = -36/9
x = -4
</span><span>Answer: b -4</span>
The information of the table permits you to state these equations:
10x + 9 y = 47
25x + 12 y = 86
16x + 12 y = 68
By subtracting the third equation from the first, you get:
9x = 18
=> x = 18 / 9 = 2
Now using any of the equations you can obtain the value of y.
I will use the first equation:
10x + 9y = 47 => 9y = 47 - 10 (2) = 27
=> y = 27 / 3 = 3
Those results are interpreted as they charge $2 for each plain wrapping and $3 for each decorative wrapping.
Then, the correct choice is " the team charged $2 to wrap a gift with no bow and $3 to wrap a gift with no bow"
Answer:commutative, associative, additive identity and distributive property
Step-by-step explanation: