Using the formula for circumference of a circle given a circle with a circumference of 21.98 cm what is the diameter

Solve: 3x+y=6 4x-2y=18 show all work !

Match the following reasons with the statements given to create the proof. 1. do = ob, ao = oc sas 2. doc = aob given 3. triangle cod congruent to triangle aob vertical angles are equal. 4. 1 = 2, ab = dc if two sides = and ||, then a parallelogram. 5. ab||dc if alternate interior angles =, then lines parallel. 6. abcd is a parallelogram cpcte

Match each set of points with the quadratic function whose graph passes through those points