This is a quadratic equation. There's a shortcut (two shortcuts really) called the Shakespeare Quadratic Formula (2b or -2b) applicable when the middle term is even:
OK, our problem is
Typically we'd write but the answers here don't so we won't either.
Answer: C and D
Answer:
70
Step-by-step explanation:
You have to use ratios. If 5 of 12 members bought water, then x of 168 members will buy water.
70 members will buy bottled water.
It's a quadratic equation in disguise. If you let , then
, and we can rewrite the equation as
Solve for however you like; we get
and
.
But we want to solve for , so we have