How do you find the value of -5 and 1/5 plus 7 and 3/4

Liesl grew 7/12 of a foot in one year. her little sister grew 1/3 of a foot during that same year. how much more did liesl grow than her little sister did

If 24 people have the flu out of 360 people, how many would have the flu out of 900. choose many ways you could use proportion that david would use to solve this problem

17 in long 1.3 ft wide and 8in high what is the volume