The hardcover version of a book weighs 7 ounces while its paperback version weighs 5 ounces. Forty-five copies of the book weigh a total of 249 ounces.
Weight of Books
Number Weight per book
of Books (ounces)
h
45-
5
45
7
Hard Cover
Paperback
Total
Which value could replace x in the table?
Total Weight
(ounces)
7h
х
249
40-
50-
5(45) -
5(45 - h)
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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

-3.5 is the distance.

i've had this question so choose the one in the absolute value sign.

this cant be answered without the graph. you may need to add it.