To how many significant figures should each answer be rounded? a) (6.62610^-34 js)(2.997910^8 m/s) / 4.07010^-7 m = 4.880610663391*10^-19 j(unrounded)b) (6.02210^23 atoms/mol)(0.589 g) / 20.18 g/mol = 1.75810^22 atoms (unrounded)

a) after rounding: 4 significant figures.

b) after rounding: 3 significant figures.

Step-by-step explanation:

Significant figures are the number of needed place values for accuracy. The product or quotient of numbers with significant figures must be rounded to the least amount present within the problem.

a) (6.62610^-34 Js)(2.997910^8 m/s) / 4.07010^-7 m = 4.880610663391*10^-19 J

4.880610663391*10^-19  rounds to 4.880 * 10^-19 since the least number of significant digits is 4 within the problem.

b) (6.02210^23 atoms/mol)(0.589 g) / 20.18 g/mol = 1.75810^22 atoms

1.75810^22 rounds to 1.76 *10^22 since the least number of significant digits within the problem is 3.

c is the answer

step-by-step explanation:

total amount of money that he should pay if he has not used his duty free exemption is $98

step-by-step explanation:

given a united states citizen returning to the states declares the following items at the customs office: 3 shirts at $8.50 each 2 dresses at $27.50 each 1 pair of gold cuff links at $17.50 per pair. we have to find how much he pay

cost of 3 shirts if one cost at $8.50 is

cost of 2 dresses if one cost at $27.50 is  

cost of 1 pair of gold cuff at $17.50

so, total amount of money that he should pay if he has not used his duty free exemption is   $25.5+$55+$17.50=$98