% means per 100
so when figuring out percents it's good to use 100
so
on $100 7% would mean $7
on $50 7% would mean $3.5
in $200 7% would mean $14
a) The tangent to 
at 
has slope
and 
at this point. It passes through the origin, so its equation is
It also passes through the point 
on the curve, so
By substitution,
b) The normal to at 
has slope
It follows that
c) The tangent line equation is then
Answer:
No
Step-by-step explanation:
25% as a decimal is 0.25
and 0.3 as a percentage is 30%
The variable x is the weight of the letter and they subtract 1 from that, so adding the 0.50 at the end of the equation would be the cost for a one ounce letter.
The answer is:
A) The cost, in dollars, to mail a one ounce letter
