Use Lagrange multipliers to find the dimensions of the rectangle with the maximum perimeter that can be inscribed with sides parallel to the coordinate axes in the ellipse x 2 a 2 y 2 b 2

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Which graph has a rate of change of zero

What is the equation of the line that is parallel to the line with the equation y= -3/4x +1 and passes through the point (12,-12)