# Chapter 10 - Radical Expressions and Equations - 10-5 Graphing Square Root Functions - Practice and Problem-Solving Exercises - Page 630: 41

a) Please see the graph. b) $400/9$ pounds per square inch

#### Work Step by Step

a) Two other points on the curve: $p=1$ $f = 120\sqrt x$ $f = 120\sqrt 1$ $f = 120*1 = 120$ $(1, 120)$ $x=4$ $f = 120\sqrt x$ $f = 120\sqrt 4$ $f = 120*2 = 240$ $(4,240)$ b) $f=800$ $800 = 120\sqrt x$ $800/120 = 120\sqrt x/120$ $20/3 = \sqrt x$ $(20/3)^2 = (\sqrt x)^2$ $400/9 =x$

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