Sniff sniff help a poor gurl from math T-T

What rule describes a dilation with a scale factor of 4 and the center of dilation at the origin?

Write each rational number in the form a/b, where a and b are integers. 1. 5 1/6 2. -12

Jennifer graphs the function f(x)=x squared. then she graphs the function f(x-3). how does the graph f(x-3) differ from the graph of f(x)