¿hoy vamos de excursión con la escuela y nos ha tocado hacer los bocadillos para toda clase. Si para hacer los bocadillos mis 4 hermanos gastamos 2 barras de pan ,¿ cuantos barras de pan necesitaremos para hacer los bocadillos de los alumnos que hay en clases?

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

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x

your answer is 125y5

good luck on ur quiz test or homework. have a good day : )