Combine the like terms 7a-7b+4a-2/5b. plzz i will give you 100 points

Factor completely. 4p^2 + 36p + 81 express the answer in the form (ap + b)^2

What situation is an example of an observational study

Rick is driving to his uncles house in greenville,which is 120 miles from ricks town .after covering x miles rick she's a sign stating that greensville is 20 miles away. which equation when solved will give the value of x. a: x+120 = 20 b: x x120 =20 c: x +20 equals 120 d: x x20= 120