Can someone help me with this? Please n thank u

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank

What is the value of the expression i 0 × i 1 × i 2 × i 3 × i 4? 1 –1 i –i