This is 8th grade algebra honors math

Step-by-step explanation:

(y² * z⁻⁵)¹/²⁰ * (y²)⁶ = y ² * ¹/²⁰  * z⁻⁵*¹/²⁰    * y ²*⁶

                             = y ¹/¹⁰ * z ⁻¹/⁴  * y ¹²

                              =  y ¹/¹⁰ ⁺ ¹²   *  z ⁻¹/⁴

                              = y ¹²¹/¹⁰ *  z ⁻¹/⁴

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

1/3 + 1/3 ≠ 2/6 because 1/3 alone = 2/6  

step by step explanation:

1/3 + 1/3 = 2/3       2/3=4/6