A submarine dove 20 feet beneath the water surface and then another 50 feet below that. Express the submarine's position beneath the water surface as an integer.

In the diagram, the measure of angle 9 is 85° which angle must also measure 85°?

3-12. write each answer with a reasonable number of figures. find the absolute uncertainty and percent relative uncertainty for each answer. (a) [12.41 (±0.09) + 4.16 (±0.01)] x 7.068 2 (±0.000 4) =? (b) [3.26 (±0.10) x 8.47 (±0.05)] - 0.18 (±0.06) =? (c) 6.843 (±0.008) x 104 + [2.09 (±0.04)- 1.63 (±0.01)] =?

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14