Which expression is equivalent to the expression below? Select all that apply. -2/5(15 - 20d + 5c)

1. -30 + 40d - 10c
2. -6 + 8d - 2c
3. -2c + 8d - 6
4. 6 - 3d + 2c

Which addition property is being illustrated below? (type commutative or associative) (6 + 7) + 1 = 6 + (7 + 1)

How can you decide witch operations to use to slice a two step equation

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