Rectangle R was dilated to form Rectangle R

Which is the scale factor of the dilation?

a 5/4
b 2/1
c 5/2
d 5/1

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

2,10,-50 next two numbers geometric sequence

Alarger number is double the sum of a smaller number. the larger number is 2 less than 3 times the smaller number. if y represents the larger number and x represents the smaller number, which equations model the situation