4 trumpet players, 5 saxophone players, 2 keyboard players. What is the probability that no keyboard players are chosen in a random selection of 4 players?

20% (1/5)

Step-by-step explanation: There are 4 players and 1 chance of none chosen, and which 1/5 of it is when no key-players are chosen as there are 5 options. 1/5=20%

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$4

step-by-step explanation:

$30×5=$150

$150 minus $130=$20

$20÷5=$4.

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e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation: