A fossilized shell contains 20% of its original carbon 14. Using 5730 years as the half-life of carbon 14, determine the age of the fossil.

What is the simplified form of (3.25x10^3)(7.8x10^6) written in scientific notation?

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

Johnny rode his bike to a friends house 4 blocks down the street in his neighborhood. he immediately rode back home once he realized his friend was unable to play. what was his displacement for the total bike ride trip? what could you use as a reference point ? show the steps to solve this problem.