Solve dy/dx + y/x square = 1/x square​

Which statement is true 1.the pythagorean theorem can be used to find the missing side of any triangle 2.the pythagorean theorem can be used to find the missing side of any polygon 3. the pythagorean theorem can be used to find the missing side of any right triangle 4.the pythagorean theorem can be used to find the missing side of any isosceles triangle

How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

Ineed i been stuck on this question since yesterday