Explain how combining like terms is similar to adding and subtracting whole numbers. how are they different?

It's similar in a sense that to combine like terms, you simply add and subtract terms together. Therefore, the operations are the same.

The difference is that you don't combine all numbers. They must have the same variable value attached to them in order to add/subtract the numbers.

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step-by-step explanation:

1,407.5 hours

step-by-step explanation:

we first convert all the time to hours and then sum them up.

there are 24 hours in 1 day, in 58 days, there are 24 x 58 = 1,392 hours.

there are 60 minutes in 1 hour, thus, 30 minutes will be equivalent to 30 / 60 = 0.5 hours.

therefore, the number of hours it will take mercury to complete a full rotation is 1,392 + 15 + 0.5 = 1,407.5 hours