Please I want help I want a correct answer

12.1, 7.4

Step-by-step explanation:

First, we all know the formula its 2R however here we see the diameter to find R we have to divide: 12.1 divided by 2=6.05 but for me thats really useless because in the end you still have to multiply it by 2 so to find the circumference just find the diameter and add a pie beside it so the answer would be 12.1 for the others do the same thing. (pls give me brainliest or something)

d.192

step-by-step explanation:

12*16=192

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