3. When Rounding avalue and the number to be dropped is equal to 5: a. The preseding number will always stay the same b. The preceding number will go up by 1 if H is odd c. The preceding number will go up by 1 if 1+ is even d. The preceding number will go down by 1 4. When repording lab values in saientifia notation a) Zero's are considered not significant figures b. a double digit base number with a decimal is always used c. a positive exponent means the value of the number 1ll be 1 or gp a negatixe exponal means there is no decimal place. 39km=cm