The circuit diagram what does the symbol made of two long lines into sure lines with a positive and a negative sign at each end represent

I think you're describing the symbol that I put down at the bottom of this answer.

If that's symbol you mean, it represents a battery.  The plus is the longer line, for the positive terminal.  The minus is the shorter line, for the negative terminal.

answer; (d) spontaneous processes are characterized by the overall conversion of order to disorder;

c. 7/3

step-by-step explanation:

a rational number is like pi- it is a repeating decimal.

a. is -1.8

b. 2.236068

c. 2.3333333333333333333

d.   is 3

i hope that ! =)