Which statement describes an example of nonpoint-source pollution?

choose all answers that are correct.

a.
acid drainage from a series of abandoned mines

b.
fertilizer from a large cornfield that may have washed into a stream

c.
toxic discharge from a pipe going directly into a lake

d.
bacteria from livestock, pet wastes, and septic systems

Is each relation a function? if so, state whether it is one-to-one or many-to-one. 3. (-4,7), (-3,5), (1,4), (3,-8), (5,-11) 4. (-4,8), (-2,4), (0,1), (2,4), (4,8) 5. (-2, 1), (-2,3), (0,-3), (1,4), (3,1)

In which form is the following function written? y = - 2(x – 3)(x + 5)

Aclassroom is made up of 11 boys and 14 girls. the teacher has four main classroom responsibilities that she wants to hand out to four different students (one for each of the four students). if the teacher chooses 4 of the students at random, then what is the probability that the four students chosen to complete the responsibilities will be all boys?