In general, reducing the interest rate (i) of a credit card but keeping the present value (PV) and number of periods (n) the same will . a.
decrease the monthly payment (P) needed to pay off the debt
b.
increase the monthly payment (P) needed to pay off the debt
c.
eliminate the monthly payment (P) needed to pay off the debt
d.
have no effect on the monthly payment (P) needed to pay off the debt

7.9m and 4.3°

step-by-step explanation:

let east be +x and north be +y, x = distance * cos θ, y = distance * sin θ  

for 3.5 south, y = -3.5  

for 8.2, x = 8.2 * cos 30 and y = 8.2 * sin 30  

for 15 west, x = -15  

total x = 8.2 * cos 30 – 15 ≈ -7.9  

total y = -3.5 + 8.2 * sin 30 = 0.6  

magnitude = [(8.2 * cos 30 – 15)^2 + 0.6^2)]^0.5  

the magnitude is approximately 7.9 m  

tan θ = y/x = 0.6/-7.9  

the angle is approximately 4.3˚ north of west