Use a sum or difference identity to find an exact value cos(15 degrees)

Me, the vertices of quadrilateral coat are c(2,0), o(7,0), a(7,2) and t(2,2). prove that coat is a rectangle.

Tim open up a new saving account with a $50 deposit and plant to deposit $20 per week into the same account.write an expression to represent the total amount in his savings account.

What is the distance from zero if a quadratic function has a line of symmetry at x=-3 and a zero at 4