A new radioactive isotope was discovered in fossilized amber. You put the amber in a time-capsule today with a note that the amber contained 20g of Isotope-X. If a person discovers your time capsule in the year 3660, and measures that there is now 13g of Isotope-X in the amber, how long is its half-life?

Fawn bought a total of 70 cakes for a tea party. she spent $3,025. fawn bought vanilla cakes for $22 each and a fruit filled cake for $55 each. the system of equations below can be used to find the number of vanilla cakes, v, and the number of fruit filled cakes, f, fawn purchased. which system of equations has the same solution as the system below.