# Chapter 2 Linear Equations and Functions - 2.5 Model Direct Variations - 2.5 Exercises - Problem Solving - Page 110: 39

See below.

#### Work Step by Step

If the variables vary directly, then $w=ad$ for some constant $a$. Plugging in the given values, here $1800=a\cdot0.5\\a=3600$. Thus the equation is: $w=3600d$. Thus if $d=1.75$, then $w=3600\cdot1.75=6300$

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