HELP PLEASE ILL GIVE BRAINLIEST

Which is the standard form for this number? (4 x 1 100 ) + (8 x 1 1,000 ) + ( 3 x 1 100,000 ) ? a) 0.004803 b) 0.04803 c) 0.0483 d) 0.483

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

1) prove that 731^3−631^3 is divisible by 100 2) prove that 99^3−74^3 is divisible by 25