Answer:
The common ratio is -6
Step-by-step explanation:
The given sequence is
The common ratio can be found using any two consecutive terms of the geometric sequence.
The correct answer is the last choice.
From the statement you can find the function that represents the percent of strontium-90 that remains after t years of the nuclear accident.
Call P the percent:
---> P = e ^ (- 0.025t)
Now you can also estimate the half-life of the isotope strontium-90:
Call Pi the initial percent and P2 the half percent:
P2 = 0.5 * P initial =>
P2 = 0.5 * Pinitial = Pinitial * e ^ (-0.025 t)
=> 0.5 = e ^ (-0.025t)
=> ln 0.5 = -0.025t
=> t = - ln (0.5) / 0.025
=> t = 27.7 years <----- half-time
Answer:
1204
Step-by-step explanation yes uu28
Answer:
67
Step-by-step explanation:
M1 +m2 + m3 have to equal 180 so
58 +16+ 39 = 113
180-113= 67
Answer:
150
Step-by-step explanation:
90-60 is 30
180-30 is150