4) There are 3 blue counters, 5 red counters and 7 green counters in a bag. A counter is taken from the bag at random.
a. What is the probability that a green counter will be chosen?
b. What is the probability that a blue or red counter will be chosen?

a) 7/15

b) 8/15

Step-by-step explanation:

a- 3 + 5 + 7 = 15 counters total, 7 green counters = 7/15

b- 3 blue + 5 red = 8 = 8/15 counters

I hope this helped, please mark Brainliest, thank you !!

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

the first option i believe

step-by-step explanation: