What do all experiments have in common? a. there must be at least two dependent measures b. there must be a control group c. there are at least two different ways in which participants are treated d. at least one independent variable will be an instructional variable?

Initially 100 milligrams of a radioactive substance was present. after 6 hours the mass had decreased by 4%. if the rate of decay is proportional to the amount of the substance present at time t, find the amount remaining after 24 hours. (round your answer to one decimal place.)

Seymour is twice as old as cassandra. if 16 is added to cassandra’s age and 16 is subtracted from seymour’s age, their ages become equal. what are their present ages? show !

X+y=-4 x-y=2 use elimination with adding and subtraction