Ok, do this =have 25 points

Interest: 3.25%

$ Amount after 3 Years: $1,317.00

Step-by-step explanation:

If Robert invest 1200 dollars in the CD for a period of 3 years, he will earn 3.25% annual interest.  

First, converting R percent to r a decimal

r = R/100 = 3.25%/100 = 0.0325 per year.

Solving our equation:

A = 1200(1 + (0.0325 × 3)) = 1317

A = $1,317.00

The total amount accrued, principal plus interest, from simple interest on a principal of $1,200.00 at a rate of 3.25% per year for 3 years is $1,317.00.

I hope this helps. If you have any more questions, please feel free to post them and someone will be able to help you, whether it's myself or others. Please leave a like, rating, and if possible, Brainliest. Have a great day!

b.an increase in a causes b to decrease

the first one, all those points on the line just make a strait line.