1. From which period is a rock at +2.7 m depth? A. Paleogene
B. Cretaceous

2. What is the average iridium content of rock 0.5 m below the K–Pg boundary layer?

A. 0.25 ppb
B. 0.30 ppb
C. 0.36 ppb
D. 41.6 ppb

3. How much more iridium was found in the K–Pg boundary layer than in rock 0.5 m below it?

A. 41.35 ppb
B. 41.60 ppb
C. 41.24 ppb
D. 39.62 ppb

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.

answer: c.

explanation:

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explanation:

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