phinah 08 Jul 2017, 17:59
Concerning #2 in the exercises: why, in the answer, is 0 < = t as opposed to "0 < t "? Thanks.
3. Solving Non-Linear Inequalties
Wondered why the answer includes equal sign at one end, while the question says "greater than".
X
Concerning #2 in the exercises: why, in the answer, is 0 < = t as opposed to "0 < t "? Thanks.
Relevant page <a href="/inequalities/3-solving-non-linear-inequalities.php">3. Solving Non-Linear Inequalties</a> What I've done so far Wondered why the answer includes equal sign at one end, while the question says "greater than".
Murray 08 Jul 2017, 20:36
As the solution says, the values where the mass will be greater than 500 is `-150 < t < 10`.
But the rocket is fired at `t = 0`, so we don't count values less than that.
At `t = 0`, what is the mass of fuel?
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As the solution says, the values where the mass will be greater than 500 is `-150 < t < 10`. But the rocket is fired at `t = 0`, so we don't count values less than that. At `t = 0`, what is the mass of fuel?
X
2000
X
Correct. And is that greater than 500?
phinah 12 Jul 2017, 10:41
Yes. Now I see it. So since it IS 2000 when t = 0 then the inequality would include t>= 0. Thanks.
X
Yes. Now I see it. So since it IS 2000 when t = 0 then the inequality would include t>= 0. Thanks.
X
You're welcome!
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