Answer:
here is the answer... for it
Step-by-step explanation:
Part A:
So the height is going to be x when you fold the sides up. So that's one part of the volume but for the width it was going to be 4 but since two corners were cut out with the length x the new width is going to be (4-2x). The same thing applies for the length which should be 8 inches but since two corners were removed with the length x it's now (8-2x)
v = x(4-2x)(8-2x)
Part B:
The volume can be graphed although there must be a domain restriction since the height, width, or length cannot be negative. So let's look at each part of the equation
so for the x in front it must be greater than 0 to make sense
for the (4-2x), the x must be less than 2 or else the width is negative.
for the (8-2x) the x must be less than 4 or else the length is negative
so the domain is going to be restricted to 0 < x < 2 so all the dimensions are greater than 0
By using a graphing calculator you can see the maximum of the given equation with the domain restrictions is 0.845 which gives a volume of 12.317
Use the change-of-basis identity,

to write

Use the product-to-sum identity,

to write

Redistribute the factors on the left side as

and simplify to

Now expand the right side:

Simplify and rewrite using the logarithm properties mentioned earlier.





(C)
Answer:
C. Paid $2.60 too much
Step-by-step explanation:
Gas 12 x 2.89 = 34.68
granola 2 x 1.59 = 3.18 x 1.075 = 3.4185
apple .89 x 1.075 = 0.95675
vitamin water 2 x 1.39 = 2.78 x 1.075 = 2.9885
34.68
3.4185
0.95675
+ 2.9885
---------------------
$42.04
$44.64
- $42.04
---------------------
$2.60