If nthe shop has a mark up rate of 50% and they cost 300 to buy you multiply 300 by 50% convert 50% to decimal
so you do .5*300=150
then you add 150 to 300 which means that the shop sells the skis for 450 dollars.
Answer:3
Step-by-step explanation : because it said it was correct
Answer: n+2
Two lawns more than last week so two more than something with n being that something is; n+2
Okay, it's wrong because they forgot to do -2 times 3x.
The correct answer is

-2x-8
Hope i got is correct!
No 20.0000004 cannot be rational.