15n+21
We dont know how much square peter buys and per square cost 15$. So thats mean peter buys 15n$
And the total delivery charge 21$
Its cost 15n+21
Answer:
15n+21
Step-by-step explanation:
The carpet costs $15 for every n square metres so we need to multiply $15 by n so
$15*n = $15n
We have to add another $21 for delivery charge so
($15n)+21 = $(15n+21)
So the final answer is $(15n+21) and it is the third option.
