Answer:
Step-by-step explanation:
<u>Find the missing side of the rectangle, use Pythagorean:</u>
- b² = 25² - 7² = 576
- b = √576 = 24 units
<u>Find area of rectangle:</u>
- A = ab
- A = 7*24 = 168 units²
Correct choice is A
Answer: 
Step-by-step explanation:
For this exercise it is important to remember the following:

Given the following expression:

You can notice that the radicand (the number inside the square root) is negative. Therefore, in order to simplify the expression, you need to follow these steps:
1. Replace
with
and simplify:

2. Descompose 12 into its prime factors:

3. Substitute into the expression:

4. Since
, you can simplify it:

The equation of a line is given by y = mx + c; where m is the slope.
The given equation is 9 - x = 2y
y = -1/2 x + 9/2
Therefore, the slope is -1/2 and the y-intercept is 9/2.