For each line, determine whether the slope is positive, negative, zero, or undefined.

line 1, the slope is positive. line 2,the slope is undefined. line 3, the slope is negative. line 4, the slope is zeeo

1. Negative

2. Zero

3. Positive

4. Undefined

Step-by-step explanation:

1. The slope is going down, therefore negative

2. A slope that is horizontal is zero

3. The slope is going up, therefore positive

4. The slope is vertical, therefore undefined

I hope this helps!

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answer: d.) the total number of protons and neutrons is 15

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