Answer:
1.9
Step-by-step explanation:
First step would be to separate r from t

Then just insert the numbers

Yes that is one way. You can also prove that a shape is a square by looking at the angles and each side are congruent to each other
Answer: Angle 2
The 7.5 cm side is opposite angle 2, so opposite = 7.5
The 18 cm side is adjacent to angle 2, so adjacent = 18
Therefore, tan(angle 2) = opposite/adjacent = 7.5/18
Replace "angle 2" with "A" and we have tan(A) = 7.5/18
The expression is
(2+4)-9
All you have to do is add 125 by 75 and you get 200. Now you have to subtract 500 by 200 which is 300 and here you go your answer is 300. The bookstore has to sell 300 more books in order to sell 500 books by friday