How can you mathematically prove that -1*-1=1. besides saying that negative times negative equals positive.

Step-by-step explanation:

-1 x -1 = 1

besides saying negative multiplied by negative gives positive, we can also say. -1 x -1=

same as -1²= 1

since we know that a negative number raise to the power of an even number changes to positive. that's how I understand your question

the answer would be 484

step-by-step explanation:

just multiply 0.484 times 1,000 (formula)