Step-by-step explanation:
look it is very easy.
use formula of simple interest
Answer:

Step-by-step explanation:
Combine like terms (terms with the same exponent).

"Standard form" means to list terms so the exponents go from high to low (descending order).
The answer would be....(r + 3w) × ( r - 3t)
Answer: a reasonable answer would be 4 balls maximum and 0 balls minimum to any of 4 given boxes with the 4 box totals = 4 balls.
Step-by-step explanation: