Sally had some marbles. After buying 12 more marbles, she had 25 marbles. How many marbles did Sally have before she bought more? 37
12
13
25

Solve each quadratic equation by factoring and using the zero product property. [tex]x^2+6x+8=0[/tex]

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

Astudy was interested in determining if eating milk chocolate lowered someone's cholesterol levels.ten people's cholesterol was measured. then, each of these individuals were told to eat 100g of milk chocolate every day and to eat as they normally did. after two weeks, their cholesterol levels were measured again. is there evidence to support that their cholesterol levels went down? how should we write the alternative hypothesis? (mud = the population mean difference= before - after)a. ha: mud = 0b. ha: mud > 0c. ha: mud < 0d. ha: mud does not equal 0