Step-by-step explanation:
just multiply the 2 together to get the area
it would just be

use the distributive property

unless you want to simplify the answer, this would be the answer
simplified, it would be

Answer:
Step-by-step explanation:
To solve this, we would use the formula for calculating simple interest which is:
Interest = PRT
Then, we will slot in the values given which will be:
84 = P × 3% × 7
84 = P × 0.03 × 7
84 = 0.21P
P = 84/0.21
P = $400
The Principal is $400