**Answer:**

To determine the compound interest of a certain investment, the following formula should be used:

X = Initial value (1 + interest rate / number of compositions) ^ years x number of compositions

Thus, in the assumption of an investment of $ 1,000 with interest compounded daily at 3% for 8 years, the formula would be the following:

X = 1,000 x (1 + 3/365) ^ (8x365)

X = 1,271.24

On the other hand, in the case of an investment of $ 1,000 with compound interest every 6 months at 3% for 8 years, the formula would apply as follows:

X = 1,000 x (1 + 3/2) ^ (8x2)

X = 1,268.99

The graph is so far below that we can't see it from here

at all, so "using" it poses a substantial problem.

**a) **Since we know they have equal perimeters, we can set them equal to each other. First, let's recap the perimeters of squares and triangles (s = side):

Now, we can set up our equation:

We can solve for x:

So,

**x = 10**.

**b) **We known the perimeter formulas and we have what x is. So, let's just plug and chug.

Square:

So, the perimeter of the square is

**28 units².**

Since their perimeters are equal the perimeter of the triangle is also

**28 units²**
<span>We can expand this expression using foil method (first, then out, then in then last), multiply them together:

(y+5)(y+7)

y^2 + 7y + 5y + 35

y^2 + 12y + 35

This is already simplified and thus is also the final answer. There are also other ways but foil method is the easiest.</span>

<span>i think 871 is the answer</span>