How much of a radioactive kind of iodine will be left after 180 days if you start with 160 grams and the half-life is 60 days?

If 1 is divided by the sum of y& 4.the result is equal to 3 divided by 4, find the value of m

Angles r and s are complementary. the measure of angle r is 31 degrees. which equation can be used to find angle s?

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?