Question 1089046
{{{abs(t-230)<=10}}} where {{{t}}}= temperature of the engine in degrees Fahrenheit says that the difference between the temperature of the engine and 230 should be no more than 10 degrees Fahrenheit.
 
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{{{abs(t-230)<=10}}} means that
either {{{0<=t-230<=10}}} ,
or
{{{0<-(t-230)<=10}}} , which is equivalent to
{{{0>t-230>=-10}}} and to {{{-10<=t-230<0}}} .
The two inequalities can be written together as
{{{-10<=t-230<=10}}} .
Adding 230 to all 3 sides, you get
{{{-10+230<=t<=10+230}}}
{{{highlight(220<=t<=240)}}}