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For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²

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