1) 2x + 13 = x + 8
2) 4x + 11 = 17 - 2x
3) x + (12 - 3x) = 3 - (5 - x) 3
4) x/2 + 4 = 7
5) x/3 - 3/4 = 7/4
6) x + 4/5 = 3-x
7) 3x + 3/4 = x + 3/2

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