Our expression is 
.
Substitute in 
. 
Follow the order of operations. Divide first. 
Add. 
Answer:
Vertex : (1, -9)
Axis of symmetry : x = 1
x-intercepts : (-2, 0), (4, 0)
y-intercept : (0, -8)
hope this is what you're looking for :)
The answer is 2(5x - 4)(x + 1)
10x² + 2x - 8 = 2*5x² + 2*x - 2*4 =
= 2(5x² + x - 4) =
= 2(5x² + 5x - 4x - 4) =
= 2(5x *x + 5x*1) - (4*x + 4*1) =
= 2(5x(x + 1) - 4(x + 1)) =
= 2(5x - 4)(x + 1)
1 - 0.16 = 0.84
21/0.84 = 25
25 grams of fiber should be consumed daily.
Since she has a base amount of $500, that will be your y-intercept. 20 is going to be your slope, and since she's withdrawing it, it will be -20. Here's how the equation would be set up (in y = mx + b):
-20x + 500 = 220
*Subtract 500 from both sides*
-20x = -280
*Divide both sides by -20*
x = 14.
Therefore, it will take 14 weeks.
