Use the confidence interval to find the margin of error and the sample mean. (1.71, 2.05)

Step-by-step explanation:

Given:

Sample 1.71 , 2.05

Find:

Margin of error

Sample mean

Computation:

1. Margin of error = (2.05 - 1.71) / 2

Margin of error = 0.34 / 2

Margin of error = 0.17

2. Sample mean = (2.05 + 1.71) / 2

Sample mean = 3.76 / 2

Sample mean = 1.88

true

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