in adding the measurements 11.074m, 18.2m and 16.943m, what should be the number of significant figures in the result

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?

The act of moving from one place to another. a. locomotor b. aerobic c. stationary d. static

What was the first instrument to ever record an earthquake?