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04.02.2020 •
Mathematics
Randall and augustine are financing $148,000 to purchase a condo. they obtained a 15 year fixed rate loan with a rate of 4.95%. they have vern given the option of purchasing up to five points to lower their rate to 4.73%. how much will the five points cost them?
a - $7,000.40
b - $325.60
c - $1,480.00
d - $7,400.00
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Ответ:
Step-by-step explanation:
to find the derivative of the function
we use the chain rule approach. which simply involves increasing x by Δx and carrying out simple arithmetic operation.
The First step is to increase x by Δx
increase x by Δx and and f(x) by Δf(x)
if we expand we have
if we expand we have
next we subtract f(x) from both sides
Next we divide all through by Δx
next we let the limit of Δx tends zero, we arrive at
hence the derivative of the function
is ![\frac{df(x)}{dx}=20x\\](/tpl/images/0455/5852/ff63c.png)