1 - tan 20 . tan 25 = tan 20 + tan 25​

What is this inequality notation? t is less then or equal to 2

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?

When 142 is added to a number the result is 64 more then 3 times the number. option 35 37 39 41