10. Simplify this expression: 13+ (-12) - (-5) = ?
A.-30
B. -6
C.6
D. 30

C

Step-by-step explanation:

Noting that

+ (- ) is equivalent to subtraction

- (- ) is equivalent to addition

Given

13 + (- 12) - (- 5)

= 13 - 12 + 5

= 1 + 5

= 6 → C

C) 6

Step-by-step explanation:

13 + (-12) - (-5) = 13 + (-12) + 5

                       = 1 +5

                      = 6

13 & (-12 ) have different sign, so subtract and put the sign of the greater number's sign.

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870