Laura''s cds are either rock or hip-hop music. she has 3 more rock cds than hip-hop cds. if a cd is taken at random from her collection, the probability that it will be hip-hop is 2/5. how many rock cds and how many hip-hop cds does she have?explain how you got your step by step !

Solve for b. ab + c= d b= a + old ob=allc-ch b= (d-c/a

Find the circumference of a pizza with a diameter of 10 inches round to the nearest tenth

Rachel is studying the population of a particular bird species in a national park. she observes every 10th bird of that species that she can find in the park. her conclusion is that the birds living in the park who belong to that species generally feed on insects. rachel's sample is . based on the sample she picked, rachel's generalization is