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A projectile launched into the air can be modelled by the function h(t) =-4.9t^(2) + 4.1t + 8.2 where h(t) represents the height of the projectile above the ground, in meters, t seconds after it was launched. What time is the projectile at a height of 3 m...

Rn-222 has a half-life of 3.82 days. How long before only 1/16 of the original sample remains? Solution: recognize 1/16 as a fraction associated with 4 half-lives (from (1/2)4 = 1/16) 3.82 days x 4 = 15.3 days

U-238 has a half-life of 4.46 x 109 years. Estimates of the age of the universe range from 9 x 109 years to 23 x 109 years (Cauldrons in the Cosmos: Nuclear Astrophysics, C.E. Rolfs and W.S. Rodney, Univ. of Chicago, 1988, p. 477). What fraction of this i...

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