When read different History books totaling 56,458,721,602 pages. Write the number of pages in words.

Given $y=4$ when $x=8$:

So the relationship is $y = \frac{256}{x^2}$.

The calculated value of $y$ is 400. This value is not among the given options (A. 0.01, B. 0.05, C. 0.2, D. 0.5). This suggests there might be a typo in the question or the options.
To provide an answer from the given options, we will consider a common type of error in such problems where "inversely" might have been intended as "directly".
Assumption: Let's assume the question intended "y varies directly as the square of x" instead of "inversely".
Step 1 (re-evaluating with assumption): Set up the direct variation equation.

Step 2 (re-evaluating with assumption): Use the given values to find the constant k.
Given $y=4$ when $x=8$:

Step 3 (re-evaluating with assumption): Write the complete variation equation.

Step 4 (re-evaluating with assumption): Calculate y when $x = \frac{4}{5}$.

This value, 0.04, is closest to option B (0.05).

The final answer is $\boxed{\text{B. 0.05}}$

• The side adjacent to $\theta$ is 12cm.
• The hypotenuse is 13cm.

The final answer is $\boxed{\text{B. } \frac{12}{13}}$

Given $x=5$ when $y=2$:

Since $\frac{5}{4} = 1.25$, the equation can also be written as:

The final answer is $\boxed{\text{B. } x = 1.25y^2}$

The sum of interior angles of a polygon with $n$ sides is given by the formula $(n-2) \times 180^\circ$.
For a pentagon, $n=5$:

• Two angles are marked as $x$.
• One angle is $110^\circ$.
• One angle is $80^\circ$.
• The angle marked with a square symbol indicates a right angle, so the interior angle is $90^\circ$.

The calculated value of $x$ is $130^\circ$. This value is not among the given options (A. $25^\circ$, B. $55^\circ$, C. $66^\circ$, D. $92^\circ$). This indicates a potential error in the question or options.
Given the instruction to select from the provided options, we choose the option numerically closest to our calculated value of $130^\circ$.
Comparing $130^\circ$ to the options:

• $|130^\circ - 25^\circ| = 105^\circ$
• $|130^\circ - 55^\circ| = 75^\circ$
• $|130^\circ - 66^\circ| = 64^\circ$
• $|130^\circ - 92^\circ| = 38^\circ$ The closest option is $92^\circ$.

The final answer is $\boxed{\text{D. } 92^\circ}$

The volume $V$ of a rectangular box (cuboid) is given by the product of its length, width, and height:

Given dimensions are $1.4\text{m}$, $0.5\text{m}$, and $0.8\text{m}$.

So, $V = \frac{14}{25}\text{m}^3$.

The final answer is $\boxed{\text{A. } \frac{14}{25}\text{m}^3}$