What are the solutions to the quadratic equation x^2-16=0

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !

Divide. –4.2 ÷ 6 = a –0.7 b 0.7 c –7 d 7 me

Full year - williamshow many square inches are in 60 square feet? 5 square inches72 square inches720 square inche8.640 square inches