Which relation is a function?

a.
{–2, 10), (–6, 10), (–2, 3)}

b.
{(0, 3), (0, 9), (12, –4)}

c.
{(5, 5), (5, 9), (5, 15)}

d.
{(–5, 1), (4, 9), (6, 10)}

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

What is always true when two whole numbers are subtracted?

Sam opened a money-market account that pays 3% simple interest. he started the account with $7,000 and made no further deposits. when he closed the account, he had earned $420 in interest. how long did he keep his account open?