12xy+6x^2 is the expression 3x(2x+4y) simplified
-8 < 2x + 4 < 10
<u>- 4 - 4 - 4</u>
<u>-12</u> < <u>2x</u> < <u>6</u>
2 2 2
-6 < x < 3
X 1 2 3
y 10 8 6
So find the slope m: (6-10)/(3-1) = -4/2 = -2
Going backwards when x = 0, y will be 12 (you can see this)
So
<span>Initial value: 12, rate of change: −2
</span>
31. +
34. -
To figure out more, just solve the known problem, and then go over what the answer would be to the unknown one until you find the answer that makes it true.
