Let

, where

and let

be any real constant.
Given this definition of scalar multiplication, we can see right away that there is no identity element

such that

because
Answer:
negative 5/7
Step-by-step explanation:
count up 5, count left 7
negative slope so negative 5/7
So,

Write in prime factored form.

Cross-cancel
Answer:
x=15 in.
Step-by-step explanation:
If the parallelograms are equal (I assume they are), then the ratios are the same. 12 is 3/4 of 16. 3/4 of 20 is 15.
Answer:
1/9
Step-by-step explanation: