Let c and d be the number of cds and dvds respectively.
c+d=12
c=12-d
The we are told that:
2c+3d=31, using c found above in this equation gives you:
2(12-d)+3d=31
24-2d+3d=31
24+d=31
d=7
So Phillip bought 7 dvds.
check...
3*7+2(12-7)=31
21+2(5)=31
21+10=31
31=31
Answer:
The answer to your question is x = 15
Step-by-step explanation:
Use proportions to solve this problem

Solve for "x"
x = 
Simplification
x = 
Result
x = 15
Answer:

Step-by-step explanation:
The midline is set on
, when the sine function is equal to zero, eliminating the effect from amplitude. The midline is a horizontal line. Hence, the equation of the midline is:

Answer:
another fractioon for 4/10 would be 2/5 or 8/20
Step-by-step explanation: