Answer:

Step-by-step explanation:
Donna's Rate is 
Rico's Rate is 

Cross-Multiply



Donna's Rate is 
Rico's Rate is 

Answer:
1 1/2
Step-by-step explanation:
1 1/2 + 3 1/2 = 5
6 1/2 - 5 =1 1/2
23’3 because I went over the test and I got it correct I’m pretty sure (sorry if I’m wrong I just went with the internet :()
Answer:
Sure
Step-by-step explanation:
Answer: 10.1246 years (approx)
Step-by-step explanation:
Here, She invests in a CD with an annual interest rate of 6.90% compounded quarterly.
Let the initial amount or principal = P
And, Let after t years it is doubled.
Therefore, 
⇒ 
⇒
( By taking log both sides)
⇒
⇒t= log 2/log 1.07080599536= 10.1245504311≈10.1246 years