Can someone help me please like ASAP

Which expression is rational? 6. , square root two, square root 14, square root 49

If 30 lb of rice and 30 lb of potatoes cost ? $27.60? , and 20 lb of rice and 12 lb of potatoes cost ? $15.04? , how much will 10 lb of rice and 50 lb of potatoes? cost?

What are the coordinates of the image of p for a dilation with center (0, 0) and scale factor 2