Final answer:
The student's question pertains to evaluating mathematical expressions, reducing fractions, converting percents to fractions, and using scientific notation with significant figures.
Step-by-step explanation:
The question seems to be about evaluating mathematical expressions and simplifying fractions or converting to scientific notation with significant figures. One example provided suggests simplifying a fraction by finding common factors in the numerator and denominator, resulting in a reduced fraction in its lowest terms.
Another example involves using scientific notation for multiplication and division while considering significant figures. The process of evaluating expressions often involves reducing fractions, canceling units, and using scientific notation for large or small numbers.
When multiplying fractions as per the mentioned rule, you should multiply the numerators together and then the denominators, simplifying if possible. Converting percents into fractions involves writing the percent as a fraction over 100 and then simplifying. Lastly, for scientific notation calculations, it's important to keep the correct number of significant figures and maintain the proper format.