Bryanna performed an experiment in which she flipped a coin and recorded the results. She got heads up 23 times and tails up 27 times. Which statements are true about the experimental probability of getting tails up? The experimental probability is written as a ratio. The experimental probability compares the number of heads up to the number of tails up. The experimental probability includes 50 trials. The experimental probability compares the number of tails up to the number of trials. The experimental probability compares the number of heads up to the number of trials.

4

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