Answer:
All identities proved
Step-by-step explanation:
The step by step proving using the distributive law property is as shown in the attachment.
and 9 are the squares of, respectively,
and 3.
So, using

we have

Answer:
11x + 4d
Step-by-step explanation:
8x + 9d + 3x -5d
To simplify this we have to group them by their like terms i.e.
= 8x + 3x + 9d - 5d
= 11x + 4d
Mark brainliest
Answer:
the 13th one is 115
Step-by-step explanation: