What is 6/18 in simplest form

Which of the following statements would be sufficient to prove that parallelograms pqrs is a rectangle ?

Circle a has center of (2,3) and a radius of 5 and circle b has a center of (1,4) and a radius of 10. what steps will show that circle a is similar to circle b 1) dilate circle a by a scale factor of 2 2) translate circle a using the rule (x+1,y-1) 3) rotate circle a 180 degrees about the center 4) reflect circle a over the y-axis

X+ 4y − z = −14 5x + 6y + 3z = 4 −2x + 7y + 2z = −17