Zero is a positive numder
b negative numder
c neither positive no negative
d either positive or negative

The number zero is neither positive nor negative

Step-by-step explanation:

Positive and negative numbers are sometimes called signed numbers

Explanation:

Positive numbers are numbers larger than 0. For example, 7 and 10 are positive.

Negative numbers are smaller than zero. Examples include -55 and -81.

Zero falls right in the middle of these two sets of numbers. It's neither positive nor negative. If it was positive, then it would be larger than 0. But a number cannot be larger than itself. Therefore, it can't be positive. We rule out it being negative for similar reasoning.

for any of you who need the translation here it is

step-by-step explanation:

find the angular size of the equatorial radius of the earth, if the horizontal parallax of the sun