**Answer:**

x=5,y=12, area=40 square units

**Step-by-step explanation:**

the answer is explained in the above picture

**Answer:**

**B**. <em>There is a 90% chance that the true value of the population proportion will fall between the lower bound and the upper bound. </em>

**Step-by-step explanation:**

**A**. <em>One has 90% confidence that the sample proportion is equal to the population proportion. </em>

Confidence interval gives an interval estimate, not an equality

**B**. <em>There is a 90% chance that the true value of the population proportion will fall between the lower bound and the upper bound. </em>

<em>Ture. </em>

**<em>C.</em>**<em> One has 90% confidence that the interval from the lower bound to the upper bound actually does contain the true value of the population proportion. </em>

Also true but <em>One has 90% confidence is not good interpretation. </em>

**<em>D</em>**<em>. 90% of sample proportions will fall between the lower bound and the upper bound.</em>

<em>Lower bound and upper bound is given to estimate population proportion. </em>

Write it out as a set of equation:

Let x be number of 8 cent stamps, y be 10 cent stamps, and z be 2 cent stamps.

x=y

z=x+y

8x+10y+2z=440

Lets first solve for x:

from x=y and z=2x(from first equation) the last equation is

8x+10x+4x=440

22x=440

x=20

know that x=20, you also know that y=20 as well, since z=x+y, z=40.

So 20 8-cent stamps, 20 10-cent stamps, and 40 2-cent stamps.

**Answer:**

The answer is 60

**Step-by-step explanation:**

6 x ( 10 + 3 ) - 18

6 x 13 - 18

78 - 18

60

**Answer:**

-12 + 6g - 6

**Step-by-step explanation:**