Answer: 
Step-by-step explanation:
https://www.khanacademy.org/math/precalculus/prob-comb/combinatorics-precalc/v/permutation-formula
I would watch a bunch of videos or ask a teacher or something for help
Answer:
(323)(2)=7 1/3
(Decimal: 7.333333)
Step-by-step explanation:
Answer:

Step-by-step explanation:
The graph is a piece-wise function.
It is made up of a quadratic function and a linear function.
The quadratic function is
and the linear function is
.
The graph of the quadratic function is defined on the interval
and the graph of the linear function is defined on the interval
.
So in short, if
, then
, else,
.
Writing these two functions as a single piece-wise function gives,

The correct answer is C.
4(2d + 5) = 8d + 20
15x + 18y = 3(5x + 6y)