Solve the following problem. Let's let marbles represent isotopes for us in this problem. A sample of marbles, containing 2 different isotopes was massed. The mass of all the marbles (atoms) together was 141.6g. It was
determined that there were 42 marbles in total (some of marble isotope#1 and some of marble isotope#2).
Marble Isotope#1 has an individual mass of 2.6g and Marble Isotope#2 has an individual mass of 3.8g.
Determine the number of each type of Marble Isotope.

in 4 days he will run   12/14

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x=30

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

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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

answer: my brother can figure it out, imma go get him so i can answer : ) edit: my brother is sleeping, sorry man

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