Paul was thinking of a number. paul halves it and gets an answer of 5.6. what was the original number

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

Given: δabc, m∠1=m∠2, d∈ ac bd = dc m∠bdc = 100º find: m∠a m∠b, m∠c

Grant simplified the expression 1.5(-3.2 + 2.5) his work is shown below explain the error in grants work