Answer:
d = 6
Step-by-step explanation:
3(2d-8)=11d-18(d-3)
6d - 24 = 11d -18d +54
6d-11d+18d = 24+54
13d = 78
d = 6
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Answer:
5(x + 2) = 11
x = 0.2
Step-by-step explanation:
5(x + 2) = 11
x + 2 = 11/5 = 2.2
so x = 0.2
Answer:
5x10^6
Step-by-step explanation:
Answer:
Step-by-step explanation:
For a first order decay, fraction remaining = 0.5n where n = number of half lives elapsed.
fraction remaining = 55% = 0.55
0.55 = 0.5n
log 0.55 = n log 0.5
-0.2596 = -0.301 n
n = 0.8625 = # of half lives elapsed
0.8625 half lives x 2.5 billion years/half live = 2.16 billion years have elapsed = age of the rock
b) 0.15 = 0.5n
log 0.15 = n log 0.5
-0.824 = -0.301 n
n = 2.74 half lives
2.5 billion years/half life x 2.74 half lives = 6.85 billion years = age of rock
It's 39. Use the order of operations to find the answer, PEMDAS