Find the percent change.
155 pounds to 130 pounds.

The two-way table shows the number of people whose hobbies are reading or solving puzzles and who either ride a motorcycle or don’t ride a motorcycle. among people whose hobby is reading, what is the relative frequency of not riding a motorcycle? express your answer as a decimal, and round it to the nearest hundredth if necessary. enter your answer in the box. reading solving puzzles ride a motorcycle 7 3 don't ride a motorcycle 5 9

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

What are the domain and range of the function? f(x) = -4 (sqrt)x