Final answer:
In mathematics, finding expressions equal to a given value involves understanding operations like multiplication or division. It is also essential to compute with the proper number of significant figures and follow rounding rules accurately, especially when converting units.
Step-by-step explanation:
Calculating Expression Values and Significant Figures in Mathematics
When faced with a question such as which expression is equal to 54.98, we must consider the context and the operations involved. In this case, let's assume the question refers to performing an arithmetic operation. If we look at an example operation, such as multiplying 45.86 by 100, moving the decimal point two places to the right gives us 4586. Applying similar logic or operations might help us determine a related expression for 54.98.
For another part of the question, computing and expressing answers with the proper number of significant figures is crucial in mathematics. For instance, if we have 56.7 multiplied by 66.99, we would round the final answer to maintain the appropriate number of significant figures, following standard rules for significant figures in multiplication and division.
Accurate calculations and proper rounding are vital, especially when dealing with measurements, such as those that require converting from customary units to metric units. Multiplying by the metric equivalent from a reference table ensures a precise conversion, like understanding that 4.93 is approximately 5, and thus, 12 times 5 equals 60.