Discover Questions

Does anyone know how to verify that a magnifying glass is a certain X? Explain what causes the difference in oxygen concentration between blood leaving the lungs and blood leaving skeletal muscles? Given that y=0 when x=1, solve the differential equation
xyδy/δx=y²+4,
obtaining an expression for y² in terms of x.? My ring is marked rse 925. I know 925 refers to silver. What does the rse stand for? What is the difference between an Algebra 1A (P) Class and 2 Year Algebra 1? Some of my friends got 2 Year Algebra 1 and I got Algebra 1A?