Determine the age of a rock containing .065g of 238uranium(Half-life: 4.5x10^9) and .042 of 206Carbon. (Assume all lead came from U). Enter answer in scientific notation and with correct...

A radioactive isotope at time t is 1/2 ^ t/t(half-life). The halflife of carbon 14 is 5730 yrs. What fraction of carbon 14 in a piece of charcoal remains after 19.0 yrs 1.600 x 10^4 yrs and 1.8000...

Find k so that the following function is continuous on any interval j(x) = kcos(x), x ≤ 0  and 7e^x − k, 0 < x     First off what does it mean by "so...

A fabric remant from a burial site has a Carbon-14 / Carbon 12 ratio of .721 of the original value. How old is the fabric in years?

Residents of the town of Maple Grove who are connected to the municipal water supply are billed a fixed amount yearly plus a charge for each cubic foot of water used. A household using 1000 cubic...

Solve for x: (give exact answers) 4x^2-3x=1 I factored and got x=1, and -4, but only my x=1 answer was accepted. I have four tries left but I am still unsure on how to find the second...

A collection of coins contains only 10-cent and 5-cent coins.There are x 5cent coins in the collection. Write an algebraic expression for of following. * The total value of the coins if for every...