FRACTIONS IT REALLY SIMPLE A REVIEW QUIZ

answer:

I cant see the last one so I hope it helps.

Step-by-step explanation:

1/10, 0.1, 10%

1/5, 0.2, 20%

1/4, 0.25, 25%

3/10, 0.3, 30%

3/5, 0.6, 60%

3/4, 0.75, 75

4/5, 0.8, 80

9/10 0.9, 90%

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