Rational Number Operations

A rational number is any number that can be expressed as the quotient or fraction of two integers, where the denominator is not zero.

Subtracting a negative number is the same as adding its positive counterpart. For example, $$a - (-b) = a + b$$ .

The result is $$-48$$ .

The greatest number is $$-3 + 15 = 12$$ .

To find the average cost per person, divide the total cost by the number of people. For example, if the total cost is $79.50 for 5 people, each person pays $$\frac{79.50}{5} = 15.90$$ .

To find the difference, subtract the smaller number from the larger number. For example, $$23.73 - 5.9 = 17.83$$ .

To find the number of lots, divide the total length of the road by the length of each lot. For example, if the road is 1.8 km long and each lot is 0.045 km, then there are $$\frac{1.8}{0.045} = 40$$ lots.

The formula is $$a - b$$ , where a and b are rational numbers.

Evaluating an expression means to calculate its value by substituting numbers for variables and performing the operations.

The result is $$17.83$$ .