Answer:
First box, second from the left,
Second box, first on the left.
Third box, third from the left.
Fourth box, Last on the right.
Step-by-step explanation:
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7-2x= 1-5x+2
Combine like terms
7-2x= 3-5x
Add 5x to both sides
7+3x= 3
Subtract both sides by 7
3x= -4
Divide both sides by 3
x= -4/3
Final answer: -4/3
Answer:
300
Step-by-step explanation:
every lamp can connect other lamps ，from the first ，it can connect the other 24 lamps，and then， the second ，can also connect other 24 。but the line between the first and the second is counted twice。
so it would be：
（1+2+3+...+24）×24÷2=300
