Question

-(-630)+915+(-630)+(-615)

Answer 1

\(-\left(-630\right)+915+\left(-630\right)+\left(-615\right)\)

\(=630+915-630-615\)

\(=915-615\)

\(=300\)

Answer 2

 -(-630)+915+(-630)+(-615)

= 630 + 915 - 630 - 615

= (630 - 630) + (915 - 615)

= 0 + 300

= 300

Answer 3

\(-\left(-630\right)+915+\left(-630\right)+\left(-615\right)\)

\(=630+915-630-615\)

\(=\left(630-630\right)+\left(915-615\right)\)

\(=0+300\)

\(=300\)