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.
A body of mass m at the top of a 100 m high tower is thrown vertically upward with an initial velocity of 10 m/s. Assume that the air resistance FD acting on the body is proportional to the velocity V, so that FD=kV. Taking g = 9.75 m/s2 and k/m = 5 s, determine: a) what height the body will reach at the top of the tower, b) how long it will take the body to touch the ground, and c) the velocity of the body when it touches the ground.
A chemical reaction involving the interaction of two substances A and B to form a new compound X is called a second order reaction. In such cases it is observed that the rate of reaction (or the rate at which the new compound is formed) is proportional to the product of the remaining amounts of the two original substances. If a molecule of A and a molecule of B combine to form a molecule of X (i.e., the reaction equation is A + B ⮕ X), then the differential equation describing this specific reaction can be expressed as:
dx/dt = k(a-x)(b-x)
where k is a positive constant, a and b are the initial concentrations of the reactants A and B, respectively, and x(t) is the concentration of the new compound at any time t. Assuming that no amount of compound X is present at the start, obtain a relationship for x(t). What happens when t ⮕∞?
Consider a body of mass m dropped from rest at t = 0. The body falls under the influence of gravity, and the air resistance FD opposing the motion is assumed to be proportional to the square of the velocity, so that FD = kV2. Call x the vertical distance and take the positive direction of the x-axis downward, with origin at the initial position of the body. Obtain relationships for the velocity and position of the body as a function of time t.
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