Write each sentence as an equation or inequality. Use x to represent any unknown number. See Example 9.
EXAMPLE 9 Write each sentence as an equation or inequality. Let x represent the unknown number.
a. The quotient of 15 and a number is 4.
b. Three subtracted from 12 is a number.
c. Four times a number, added to 17, is not equal to 21.
d. Triple a number is less than 48.
Solution
One increased by two equals the quotient of nine and three.
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