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:
186.3
To find the answer you have to do inverse operations
9×20.7=186.3
186.3÷20.7=9
Answer:
1/5
Step-by-step explanation:
= 25 so x = -2 because 
= 25
if x = -2 then plug in: 5^1/2(-2) = 5^-1 = 1/5
Answer: C
Step-by-step explanation: all real numbers can solve this problem
Answer:576
Step-by-step explanation:
Volume is all the sides multiplied together. 12 x 6 x 8=576
