The correct selling price is about $20, and the likely mistake was the manager multiplied the $12 by .67 (the 67%), got about 8, and took that as the price instead of adding it to the original 12, which is what they were supposed to do.
Answer:
1.first add 5, then 8 then 11, then 14 so it goes 3 by 3
3. you add 25 each time
4. you add 9 each time
I couldn't solve second and fifth one
Answer:

Step-by-step explanation:
Remember 
You are given the fraction 
First, multiply the numerator and the denominator by -2-3i:

This gives you 13 in denominator, now multiply two complex numbers in numerator:

Thus, the initial fraction is

Answer:

Step-by-step explanation:
It is given that,
The average distance between the Earth and the Moon is 384 400 km.
We need to express in in standard form.
1 km = 1000 m
It means,
384400 km = 384400000 km
or
= 
Hence, the average distance between the Earth and the Moon is
.
Answer:
C. The circle is circumscribed about ΔABC
Explanation:
The circumscribed circle of a polygon is a circle that passes through all the vertices of the polygon.