How can i solve proportions for missing sides in geometry?

John bought 5 lemons and used 2 of them for a salad how much did he use for.a salad . he used % of the lemons.

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

Which of the following tables represents exponential functions?