Me with problem 1 of systems of linear inequalities

To solve correctly, graph both inequalities.   The solution is where they overlap.  See attachment for graph. Which coordinate is plotted in the overlapping section?

If you don't have the tools to graph them, then plug each coordinate into both inequalities.  The coordinate that makes a true statement for BOTH inequalities, is the answer.

(0, 4):   4 > -2   TRUE              0 + 4 < 4   FALSE

(-3, 5): 5 > -2 TRUE              -3 + 5 < 4 TRUE         THIS IS THE ANSWER!

(1, 4):   4 > -2 TRUE                1 + 4 < 4  FALSE

(-2, -3):  -3 > -2 FALSE          

(-3, 5)

1gm = 1000mg so 0.1gm = 1000mg

first, convert the weight to kg

160lb * 1kg/2.2lb = 72.7kg

next, the dose

72.7kg * 100mg/kg = 7270mg