Select the correct answer from each drop-down menu. a scientist is observing a sample of a radioactive substance. the table below shows the amount of the radioactive substance remaining, in milligrams, with respect to time, in hours, since the scientist began observing the sample. time (hours) 1 2 3 4 5 amount remaining (milligrams) 288 144 72 36 18 the independent variable in the relationship is the(time or amount remaining)and should be placed on the(x or y ). the dependent variable in the relationship is the(time or amount remaining)and should be placed on the(x or y ).

This is the 1/2 life formula. At time 0, the sample starts out 288 mg. That's the peek amount as far as he is concerned. It doesn't matter how that 288 mg got there. It only matters that that is his starting point. An hour later, he has 144 mg left. 2 hours later the number dropped to 72 and so on down.

So here are your answers

If you are curious

Formula: P = A(1/2)^(x) where x starts at 0.  

7. 153.86 ft

8. 12.56 ft

9. 78.5 m

10. 379.94 in

11. 132.665 m

12. 12.56 yd

13. 226.865 ft

14. 113.04 ft

15. 63.585 ft

16. 254.34 m

17. 50.24 cm

step-by-step explanation:

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step-by-step explanation:

always plug in x. in this case, x equals 4.

i'm going to first solve 4(2+3x)

1) 4(2+3(4)) use pemdas to solve.

i'm going to multiply whats in the parenthesis first, so 3 times 4=12.

2)4 (2+12) i'm then going to multiply 4 by both numbers in the parenthesis (because multiplying comes before adding)

4 times 2= 8.   4 times 12= 48

4) (8+48)= 56 (answer)

i'm then going to solve 8+12x and plug in 4 for x.

1) 8 +12(4)

multiplying comes before adding, so i'm gonna multiply 12 and 4.

12 times 4= 48.

2) 8+48=56

both equal the same!