Can i plzz get some with mathh

the line segment is reflected about the y-axis to form a'b'. which statement describes a'b'?

a'b' is half the length of ab.
a'b' and ab are equal in length.
a'b' is greater than twice the length of ab.
a'b' and ab are perpendicular.

Anyone know? will mark brainliest if you're correct!

Astandard american eskimo dog has a mean weight of 30 pounds with a standard deviation of 2 pounds. assuming the weights of standard eskimo dogs are normally distributed, what range of weights would 99.7% of the dogs have? approximately 26–34 pounds approximately 24–36 pounds approximately 28–32 pounds approximately 29–31 pounds

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys