Timed I need help please

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

The equation of a parabola is given. y=18x2+4x+20 what are the coordinates of the focus of the parabola?

Pamela has a 30-year, 5.75% mortgage on her $250,000 home. she has been paying on it for 5 years, and has recently hit some financial trouble. if her lender agreed to lower the interest rate on her $231,905.47 balance to 5.5%, what will her new payment be for the remainder of the loan?