Choose the correct simplification of 9x^2(4x + 2x^2 -1)

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Which graph represents the parent function of y=(x+2)(x-2)

Look at the figure below: triangle abc is a right triangle with angle abc equal to 90 degrees. the length of ac is 5 units and the length of ab is 4 units. d is a point above c. triangle adc is a right triangle with angle dac equal to 90 degrees and dc parallel to ab. what is the length, in units, of segment cd?