(will give brainliest plsss halp)
draw a two-color counter model for each number sentence. then determine the sum

10 + (-8)

2

Step-by-step explanation:

if you are adding a large positive to a semi-large negative like 10 is the positive and 8 is negative. add 10 to-8 'till you get to 0 then add on 0 what ever amount of positive you have left in this case 2 is the answer.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

step-by-step explanation:

it's is b