Answer:
51 DVDs
Step-by-step explanation:
Let the number of DVDs and CDs sold be x each.
<u>Initial</u>
Number of DVDs= 86
Number of CDs= 52
<u>After selling</u>
Number of DVDs= 86 -x
Number of CDs= 52 -x
Given that there are 3 times as many DVDs than CDs left,
86 -x= 3(52 -x)
<em>Expand:</em>
86 -x= 156 -3x
<em>Bring x terms to 1 side, constant to the other:</em>
3x -x= 156 -86
<em>Simplify:</em>
2x= 70
<em>Divide both sides by 2:</em>
x= 35
Amount of DVDs left
= 86 -x
= 86 -35
= 51
Answer:
14
Step-by-step explanation:
To find TV you must add the length of TU (6) by the length of UV (4x) to find x to find the length of TV(7x).
6<u>+4x</u>=7x
Do inverse operations to solve for x.
6=<u>3x</u>
x=2
Now that we know x is 2, we must substitute 2 in for the x in the equation for TV (7x).
7 × 2 = 14
TU = 14
5n cents
hope this helps!!!
Answer: There is an extra O2 molecule left over.
Step-by-step explanation: A reaction between four oxygen molecules and two methane molecules will not have any leftovers.
