With these questions?

mercury-197 has a half life of about 64 hours. after 288 hours about how many miligrams of a 750mg sample

643 mg
167 mg
33 mg
17mg

in 2010, a city population was 55,210 and it was declining at a rate of 1.09 each year. what is the best prediction for when the city population will first be below 48,000?
2019
2022
2025
2028

a population of 430,000 toads is expected to shrink at a rate of 5.5 per year. what is the best prediction for the toad population in 14 years?
236,500
194,766
59,125
13,821

Lindsay used two points, (x,y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

Michelle and julie work at a catering company. they need to bake 264 cookies for a birthday party that starts in a little over an hour and a half. each tube of cookie dough claims to make 36 cookies, but michelle eats about 1/5 of every tube and julie makes cookies that are 1.5 times as large as the recommended cookie size.it takes about 8 minutes to bake a container of cookies, but since julie's cookies are larger, they take 12 minutes to bake. a. how many tubes should each girl plan to bake? how long does each girl use the oven? b. explain your solution process what did you make? c. what assumptions did you make?

Ab and bc are tangent to circle d. find x is ab = 3x + 8 and bc = 26. find x