Given the following question:
First expression:
Second expression:
Answer:
22
Step-by-step explanation:
The standard form for an equation of a circle is 
, where h is the x coordinate of the center of the circle, k is the y coordinate, and r is the radius of the circle. Therefore, the radius of this circle squared is 121, meaning that the radius of the circle is 11. Since the diameter of a circle is twice the radius, the radius of this circle is 22. Hope this helps!
Answer:
a. n= 1x +7
b. n= 12 + 4x
Step-by-step explanation:
Two cheaper books = x
more expensive = 1.5x
so, 2.5x=150
150/2.5=x=60
therefore the more expensive book = 90
