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: The first graph demonstrates the best measure of center!
P.s if you feel this answer is satisfactory please mark it brainiest. I need it for my rank.
0.04, or 4 hundredths is 10 percent of 0.40
10 times 0.04 gives you 0.40
