If I understand your question correctly then it's simple all you have to do is use the numbers in the place of the b and c so the question would be what is 8-7 which equals 1
Answer: Qualitative graphs are graphs that are used to represent situations that do not necessarily have numerical values. Qualitative graphs represent the essential elements of a situation in a graphical form. For example, Graph A could represent a car that is accelerating at a constant rate.
Based on the information given, it should be noted that Liz will stop exercising at 5.15 p.m.
Since Mike exercised for 90 minutes and Liz exercised half an hour less than Mike. Then, the number of minutes used by Liz will be:
= 90 - (1/2 × 60)
= 90 - 30
= 60 minutes = 1 hour
Now, the time that Liz stopped exercising will be
= 4.15pm + 1 hour
= 5.15 pm
Liz will stop exercising at 5.15 p.m.
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Consider the substitution 
. Then by the double angle identities we get
We also have
so that
and the original equation has been transformed to
Solve for 
:
Solving for 
gives
where 
is any integer. Both 
and 
are 
-periodic, which is to say
so that
and we find that
