There are 15 mystery books are on the shelf
Y = 5x because 5 times the x number ( for ex. 12) is equal to the y number (60)
Answer:
See explanation and attachment
Step-by-step explanation:
SOH CAH TOA is a mnemonic.
SOH means 
CAH means 
TOA means 
Given an angle and a side of a right angle triangle, you can use the appropriate ratio to find the missing side.
For instance, find x in the diagram in the attachment.
In this case the best ratio to use is TOA.



All the other ratio also follow the same pattern
NB: Your calculator in degree should give 
Answer:
Step-by-step explanation:
x2-9 = 0
Area of one dimension = x-3= 0
So, x2= 9
Square root on both sides;
x= +3 and -3
x-3 is one side
x+3 is the other dimension
Answer: i'm pretty sure it's 38,500
Step-by-step explanation: