The answer is the first one A
C=

so
18.84=2*3.14r
18.84=6.28r
r=3

A=3.14*9
A=28.26 or when rounded is 28
Hope that helps
Y=7 is linear
y=3x^2+1/2x-x^3+1 is neither
y=2x+5x^2-1 is quadratic
y=x/(x-1) is neither
y=(x^2+8x-20)/4 is quadratic
y=(x+5)(x-4) is quadratic
Answer:
There are 9 lemon bars left from the batch.
Step-by-step explanation:
One batch = 15 lemon bars
Josh: ate 2 lemon bars

13 lemon bars remaining.
Claire: ate twice as many as Josh
Meaning: 2 × 2 = 4

9 lemon bars remaining.
There are 9 lemon bars left from the batch.
Since both sides has same factor (x+6), we can set (x+6) equal to 0.
So we would have one of solution x = -6. (because this would have us x·0 = 4·0 )
Now when x is NOT equal to -6, we can divide both sides by (x+6), leaving us
x = 4
So answer is x = -6 or 4.