3. C
A 75 students
2. A,B E
4. A
5. A
1. C
A
I am not sure why you pasted questions above in different order but I answered them
A 75 students
Answer:
1 1/6 or 1.16
Step-by-step explanation:
You can find the decimal by dividing 7 by 6 or 7÷6, which equals the answer above, 1.16.
The answer is 0.333, or 1/3
So he bought 12 CDs and DVDs (in total), CDs + DVDs = 12
Each cd is 2 and each cd is 3
Total spent = 31 (2*x + 3*y)
I call x cds and y dvds
x+y = 12
2x+3y = 31
Solve for y
Move x to the right with changed sign
y = 12-x (DVDs, you can also write x = 12-y)
And substitute 12-y in the equation
2x + 3(12-x) = 31
2x + 36 - 3x = 31
2x - 3x = 31 - 36
-x = -5
x = 5 (CDs)
To find DVDs let's rewrite y = 12-x
y = 12-5 = 7 (DVDs)