Let the unknown number be y.
We can list the equation out by the clues given.
5y + 12 = 52
Then solve this as simple algebra!
Shift +12 to the other side and be - 12
5y = 52-12
5y = 40
Shift x5 to the other side and be ÷5
y = 40 / 5
y = 8
Therfore the unknown number is 8.
The answer that I got is C=-6
P+ b= 207
p-59= b
P+ (P-59)=207
2p-59=207:
2p =207+59
p=266/2
P=133
b=133-59
b=74
psych books= 133
biology books= 74
74+133= 207(Check)
The solution of your problem is shown on the picture.
Answer:
Draw a line that crosses point C so when it crosses AB it forms two 90 degree angles
Step-by-step explanation: