Perform the indicated operation and express the result as a simplifi...............................................................................................................

David gained 13 pounds over the winter He went on a diet and lost 27 pounds Then he reganed 3 pounds and weighed 1717 pounds How much did he wogh angrath

An unknown compound has the following chemical formula: where \( x \) stands for a whole number. Measurements also show that a certain sample of the unknown compound contains 8.2 mol of chlorine and 1.65 mol of phosphorus. Write the complete chemical formula for the unknown compound.

2. Prove that \( \frac{1}{2}\left\{\frac{\sin \theta}{1+\cos \theta}+\frac{1+\cos \theta}{\sin \theta}\right\}=\frac{1}{\sin \theta} \).

An unknown compound has the following chemical formula: where \( x \) stands for a whole number. Measurements also show that a certain sample of the unknown compound contains 8.7 mol of nitrogen and 13.2 mol of oxygen. Write the complete chemical formula for the unknown compound.

(iii) \( \tan \theta=\frac{3}{4}, \theta \) in quadrant III