Answer:
b. 156
Step-by-step explanation:
A "perfect square" is the product of <em>an integer that is being multiplied by itself. </em>
<em>Choice a</em>, 625, is a perfect square because it is the product of 25 multiplied by itself.
<em>Choice b</em>, 156, is not a perfect square because you cannot find any integer that can be multiplied by itself that will result in 156 as a product. Therefore, <u>this is the correct answer.</u>
<em>Choice c,</em> 196, is a perfect square because it is the product of 14 multiplied by itself.
For this case we must solve the following equation:
We remove the parentheses on the right side:
We add similar terms on the right side:
We subtract from both sides of the equation:
We add 9 to both sides of the equation:
We divide by 8 on both sides of the equation:
We apply square root to both sides of the equation:
We have two roots:
Answer:
In this question, it is given that two of the dimensions are 3 cm and 9 cm . Let the other dimension be x cm .
And the surface area of the rectangular prism is given. Now we use the formula of surface area of prism, which is
Subtracting 27 to both sides,
Dividing both sides by 12
So the length of the remaining dimension is 6 cm .