Select the relations that are functions.
{a, 1), (6, 1), (c, 1);
{a, , , c)}
{(1, a), (2, , a)}
{a, a), (b, b), (c, c)}

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years