Edward C. answered • 04/16/15

Caltech Grad for math tutoring: Algebra through Calculus

First calculate what the upper limit of the pressure (p) is equal to, which is half the age (a) plus 110

Upper limit is p = (1/2)*a + 110

The upper limit is a maximum value so good values will be less than this which means

p ≤ (1/2)*a + 110 is the inequality

If a = 76 then

p ≤ (1/2)*76 + 110

p ≤ 38 + 110

p ≤ 148 is the normal pressure