I need help with these three questions. A walkthrough the problem would be appreciated I want to under the problems.

All the problems need to show the procedure to get the final answers. 1. A student measured the mass of a meter stick to be 150 gm. The student then placed a knife edge on 30-cm mark of the stick. If the student placed a 500-gm weight on 5-cm mark and a 300-gm weight on somewhere on the meter stick, the meter stick then was balanced. Where (cm mark) did the student place the 300- gram weight?EGG 131L, Lab 8 Manual, 90 points Alcohol D = WSA - WSL 70 - 63 7 8 =0. 875 D=. 87 9 1cm3 WSA - WSW - 70 - 622. Refer to Lab 8 (a) A sinker of 4 Oz is weighed to be 3 OZ in water. How many Oz will it weigh in the alcohol used in Lab 8? (15 points) (b) An iceberg with a cuboid shape is floating on the sea. The density of ice is 917 kg/m', and the density of seawater is 1030 kg/m'. If the volume of the iceberg under the sea is 10 cubic miles and the height of the iceberg above the sea is 100 ft, how many acres is the horizontal area of the iceberg? (20 points)