What is the missing numerator?

4

Step-by-step explanation:

Ok, so first, you need to get the denominators to be equal so you'd multiply x/5 by 4 to get 4x/20 and -1/4 by 5 to get -5/20

4x/20 - 5/20 = 11/20

add 5/20 to get 16/20

4x/20 = 16/20

multiply both sides by 20 to cancel out fractions

4x = 16

divide by 4

x=4

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

its line 2 i just added the rest or else it wouldn't let me answer