a. The number n of monthly payments of P dollars each required to pay off a loan of A dollars in its entirety at interest rate r is given by n = − log 1 − A r 12 P log 1 + r 12 b. college student wants to buy a car and realizes that he can only afford payments of $ 200 per month. If he borrows $ 3000 and pays it off at 6 % interest, how many months will it take him to retire the loan? Round to the nearest month. c. Determine the number of monthly payments of $ 611.09 that would be required to pay off a home loan of $ 128 , 000 at 4 % interest.
a. The number n of monthly payments of P dollars each required to pay off a loan of A dollars in its entirety at interest rate r is given by n = − log 1 − A r 12 P log 1 + r 12 b. college student wants to buy a car and realizes that he can only afford payments of $ 200 per month. If he borrows $ 3000 and pays it off at 6 % interest, how many months will it take him to retire the loan? Round to the nearest month. c. Determine the number of monthly payments of $ 611.09 that would be required to pay off a home loan of $ 128 , 000 at 4 % interest.
Solution Summary: The author uses the expression n=-mathrmlogleft to calculate the time taken by a student to clear his loan.
a. The number
n
of monthly payments of
P
dollars each required to pay off a loan of
A
dollars in its entirety at interest rate
r
is given by
n
=
−
log
1
−
A
r
12
P
log
1
+
r
12
b. college student wants to buy a car and realizes that he can only afford payments of
$
200
per month. If he borrows
$
3000
and pays it off at
6
%
interest, how many months will it take him to retire the loan? Round to the nearest month.
c. Determine the number of monthly payments of
$
611.09
that would be required to pay off a home loan of
$
128
,
000
at
4
%
interest.
1. Show that the vector field
F(x, y, z)
=
(2x sin ye³)ix² cos yj + (3xe³ +5)k
satisfies the necessary conditions for a conservative vector field, and find a potential function for
F.
1. Newton's Law of Gravitation (an example of an inverse square law) states that the magnitude
of the gravitational force between two objects with masses m and M is
|F|
mMG
|r|2
where r is the distance between the objects, and G is the gravitational constant. Assume that the
object with mass M is located at the origin in R³. Then, the gravitational force field acting on
the object at the point r = (x, y, z) is given by
F(x, y, z) =
mMG
r3
r.
mMG
mMG
Show that the scalar vector field f(x, y, z) =
=
is a potential function for
r
√√x² + y² .
Fi.e. show that F = Vf.
Remark: f is the negative of the physical potential energy, because F = -V(-ƒ).
2. Suppose f(x) = 3x² - 5x. Show all your work for the problems below.
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