If x^4-y^4=-15 and x^2-y^2=-3, what's the value of x^2+y^2?
i need work shown too please

According to the national center for health statistics, in 1990, 28 % of babies in the united states were born to parents who were not married. throughout the 1990s, this increased by approximately 0.6 % per year. if this trend continues, in which year will 52 % of babies be born out of wedlock? in__52 % of babies will be born out of wedlock