Explain why the square root of 64 has a positive and a negative value.

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z

240 seventh graders and two-thirds of the students participate in after-school activities how many students participate in after-school activities