The table shows how many words Kelsey typed for three different assignments in a typing class. Time In Minutes Words
Which student's average typing speed most closely matches Kelsey's average typing speed?
O A. Greg typed about 5 words per minute on each assignment.
O B. Javier typed about 15 words per minute on each assignment.
O c. Laurie typed about 30 words per minute on each assignment.
O D. Matt typed about 60 words per minute on each assignment.

a

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