Devaughn is 13 years older than sydney. the sum of their ages is 77 . what is sydney's age?

Which of the following is true for the relation f(x)=2x^2+1

10% of 1,900,000. show me how you got the answer

Afamily has five members. a mom, a dad, two sisters, & a brother. the family lines up single file. what is the probabillity that the mom is at the front of the line