There is a bag filled with 3 blue marbles, 7 red and 1 yellow.
Deeka picks out a marble from
the bag, notes its colour and
replaces it. She then takes
another marble out of the bag.
What is the probability of getting
exactly 1 blue?

6/11 you could pull one of the three blues first or one of the three blues second

At least that's my best guess

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