What equation would you use to calculate the ideal mechanical advantage of a wheel and axle? this is science not physics

The place you get your hair cut has two nearly parallel mirrors 6.00 m apart. as you sit in the chair, your head is 2.00 m from the nearer mirror. looking toward this mirror, you first see your face and then, farther away, the back of your head. (the mirrors need to be slightly nonparallel for you to be able to see the back of your head, but you can treat them as parallel in this problem.) how far away does the back of your head appear to be?

Science and technology are interdependent. advances in one lead to advances in the other. give an example of this phenomenon.

Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?