alleryStart learning →How is the inequality x less than or equal to 1 written in interval notation?
AThe interval (-infinity, 1)
BThe interval [1, infinity)
CThe interval (-infinity, 1]
DThe interval (1, infinity)
Answer & Solution
Correct answer: C. The interval (-infinity, 1]
1. Every number to the left of 1 works, and 1 itself works too.
2. An included endpoint takes a bracket, so 1 is written with a bracket.
3. There is no lower end, so negative infinity opens the interval.
_Source: OpenStax Intermediate Algebra (CC BY 4.0), Ch 2 "Solving Linear Equations", section 2.5 Solve Linear Inequalities_
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