4x2 - bx + 25 If the following expression is a perfect square what’s the value of b?

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?

Which inequality is equivalent to -3x < -12? x < 4 , x < -4 , x > 4, x > -4

Which statement about 6x2 + 7x – 10 is true?