-13 (-8)= pleas hel m I will give you 5 starsss

108

Step-by-step explanation:

negative × negative = positive

13

×8

104

104

Step-by-step explanation:

To start off, you should know that multiplying 2 negatives will get you a positive number, therefore you can just remove the negative signs. Leaving you with:

13(8)

Then, simply do multiplication to get your answer of 104.

Hope this helped!

dd

step-by-step explanation:

dd

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