Answer:

Step-by-step explanation:
, substitute
to x
=
or 3.75
=
= 
Answer:
$10.80
Step-by-step explanation:
1. Multiply $12 X 10%
2. convert 10% to decimal = .10
3. 12 X .10 = 1.20
4. Subtract 1.20 from 12
5. 12-1.20 = 10.80
Answer:
3 : 1
Step-by-step explanation:
Gold : tetra
21 : 7
3 : 1