Encyclopedia britannica's list of 20 world class orchestras include the following from the united states: boston symphony orchestra, cleveland orchestra, chicago symphony orchestra, los angeles philharmonic, new york philharmonic, philadelphia orchestra, and the san francisco symphony. choose 5 at random from the list of 20 for a benefit cd.
what is the probability that the collection will include at least one group from the united states?
at least 2 from the united states?
that all 5 will be from the united states?

it's a question with 3 different parts. explain how you did it. : )

dude thats to long figure it

step-by-step explanation:

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places