Answer:
9
Step-by-step explanation:
21^2-19^2=80
sqaure root of 80 to the nearest 10th is
Answer:

Step-by-step explanation:
Factor the equation
using formula for difference of the cubes:

then

1. The equation
has real solution 
2. The equation
has negative discriminant
then it has two complex solutions

Answer:
30 cards
Step-by-step explanation:
You would multiply 6.5 times 4/13 and then add that to 6.5 to know the amount of uncooked rice you need so...
6.5x4/13=2
2+6.5=8.5