$1620
calculate simple interest ( I) using I = PRT
where P is the amount borrowed, R is rate of interest and T is time in years
note that R = 6% =
= 0.06
I = $9000 × 0.06 × 3 = $1620
This is why you have a calculator m=3
The cylinder is a clue to use cylindrical coordinates. Taking

and

, we then are forced to use

. So the parameterization of the intersection of the plane and cylinder is

To get the surface, we can introduce a second parameter

that "contracts" the elliptical intersection to a point. The simplest way to do this is to use

with

and

.
12.) m=26
19-(-7)/-1-(-2)=26
13.) 14
8-(-20)/5-3=14
14.) -4/5 is the slope
Count rise over run and always make sure whether to add a negative based on the direction of the line. In this situation, the line is negative so there is a negative sign present.
The solution for x is D=-4