Work out the answers to:
a) 4-7
b) (-3) + 8
c) 9-11
d) (-2) -4

-3, 5, -2, and 2

Step-by-step explanation:

4-7 is like 7-4 and the answer you get you add a negative sign

-3+8. On a number line its 5, you move to the right because its adding, and get 5.

9-11, again on a number line, this time move to the left, because subtraction, and get -2

-2-(-4). On a number line, start at -2. Move 4 to the left, subtraction, and get -6

it is true

step-by-step explanation:

all the combinations add up i used   calculator

12

step-by-step explanation:

a triangle's   full angle is 180 degrees so 180 - 156 = 24. 24/2=12