Question 1204102
You want speed of sound as a function of temperature.  The description is giving
information for you to fit the information into a point-slope equation for a line.


If you choose temperature F and speed Y then the description directly gives
{{{Y-1087=1(F-32)}}}
or more simply  {{{Y-1087=F-32}}}.


Maybe you can figure out the rest.
(Yes 1100 feet per second at that temperature)


Yes.  You are correct.

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(??)

This needs to make sense, without trouble.  {{{Y-1087=1(F-32)}}}
This step must be clear to you ,  {{{Y-1087=F-32}}}
{{{Y=F-32+1087}}}, and you know how and why.
{{{Y=F+1055}}}-------sound speed as a function of Fahrenheit temperature


Temperature specified was 45 degrees Fahrenheit.
so speed Y must for that be
{{{Y=45+1055}}}
{{{Y=1100}}}-------------This is the value for speed which you will then continue to work with.