First you have to convert the numbers to the same units. Either m to cm or cm to m.
To go from meters to centimeters you multiply the number by 100.
7*100=700cm
Now you have 700cm/250cm. This needs simplified
I divided each number by 50 to get 14 and 5
14cm/5cm or 14cm:5cm
For a cube,

The volume is the cube of the side length.


To raise a product to an exponent, raise each factor to the exponent.

To raise a power to a power, multiply powers.
The answer would be -27 but since you aren't using negatives, A trick I use is cross the line change the sign. So it would be 1/27 I believe
To solve this, you just simply divide to get a decimal and then convert to a percentage.
2.5 divided by 9.2 is equal to approximately 0.2717.
You then multiply that by one hundred to get a percentage. So the final answer is approximately 27.17%.