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Basic Math/No smaller than 20
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Question
Hi John. I have a quick question for you.
When question says, "no smaller than 20", does it exclude 20 (20<X)?
Precisely. "no smaller than 20" excludes 20.
Mathematically, we can express this in two ways.
Either x > 20
OR
x in (20,infinity)
would do.
The second form uses the round bracket to specify an open interval from 20 and beyond, towards positive infinity.
If, you want to specify "greater than or equal to 20",
you can write x>=20
OR
x in [20, infinity)
Here, the square bracket indicates a closed interval, i.e., the value of 20 is included as a possible value.
Cheers,
Josh
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Answers by Expert:
Josh
Expertise
When I work through problems, I like to emphasize concepts which I believe are worth noting. I will try to answer questions in the following areas, but not at the advanced level. Algebra. Sequences & Series. Trigonometry. Functions & Graphs. Coordinate Geometry. Quadratic Polynomials. Exponential & Logarithms. Basic Calculus. Probability, Permutation and Combination. Mathematical Induction. Complex numbers. Physics problems.
Experience
I have worked as a teaching assistant in college. My hope is that more people will share knowledge without boundary, give help without seeking recognition or monetary rewards.
Education/Credentials
Bachelor degree in Engineering Science
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