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Yuki888 [10]
4 years ago
7

Find the value of each power?

Mathematics
2 answers:
sweet [91]4 years ago
5 0
1=-8          l
4=100       l
7=?           l
llllllllllllllllllllll
Natali [406]4 years ago
5 0
8^-1= 1/8^1= 1/8
10^2= 10×10= 100
4^-5= 1/4^5= 1/1024
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Answer ASAP for five stars and brainliest!
allochka39001 [22]
Part 1:

Given that the <span>half-life of a radioactive kind of antimony is 60 days. The amount of substance left of a radioactive substance with a half life of </span>t_{ \frac{1}{2} } after time t, is given by:

N(t)=N_0\left( \frac{1}{2} \right)^{ \frac{t}{t_{ \frac{1}{2} }} }

where: N_0 is the original amount of the substance.

Thus, in 240 days, the amount that will be left of the antimony given that the original amount of the antimony is 960 grams is given by:

N(t)=960\left( \frac{1}{2} \right)^{ \frac{240}{60} } \\  \\ =960\left( \frac{1}{2} \right)^4=960\left( \frac{1}{16} \right) \\  \\ =60\ grams


Part 2:

Given that the half-life of a radioactive kind of tellurium is 70 minutes. The amount of substance left of a radioactive substance with a half life of t_{ \frac{1}{2} } after time t, is given by:

N(t)=N_0\left( \frac{1}{2} \right)^{ \frac{t}{t_{ \frac{1}{2} }} }

where: N_0 is the original amount of the substance.

Thus, in 280 minutes, the amount that will be left of the tellurium given that the original amount of the antimony is 480 grams is given by:

N(t)=480\left( \frac{1}{2} \right)^{ \frac{280}{70} } \\ \\ =480\left( \frac{1}{2} \right)^4=480\left( \frac{1}{16} \right) \\ \\ =30\ grams


Part 3:

Given that a town's population is currently 10,000. If the population of the town doubles every 38 years, than in 76 years from now, the population of the town must have doubled twice, thus in 76 years from now, the population of the town is given by:

10000(2)^2=10,000(4)=40,000
7 0
3 years ago
A number is first decreased by 40% and then again decreased by 60%. Find the percentage increase or decrease in the whole sum...
dangina [55]

Answer:

It is decreased by 76 percent.

Step-by-step explanation:

The key skills are percentage and multiplication with percentages.

  1. You first have to get a variable. Let's use the letter o as a variable (o For orginial cost).
  2. Then we have to find out how much it is when o is decreased by 40 percent. 100% (or the whole) - 40% is 60%. Therefore, with a 40 percent decrease, It would be 60% of o, or 0.6o.
  3. Then, if it decreases by 60 percent, the final number would be 100% - 60 % or 40% of 0.6o. This means itbwould be 0.4 × 0.6o which is 0.24o
  4. 0.24o means that o is 24 percent of its orginial number, which is 100% - 24% or a 76 percent decrease.

<u>Hope</u><u> </u><u>you</u><u> </u><u>understood</u><u> </u><u>and</u><u> </u><u>have</u><u> </u><u>a</u><u> </u><u>nice</u><u> </u><u>day</u><u>!</u>

5 0
3 years ago
Simplify. -2(3)2 - 8 ÷ 2 + 6
drek231 [11]
2(3)2 - 8 ÷ 2 + 6
(6) 2 - 8 ÷ 2 + 6
12 - 8 ÷ 2 + 6
12 - 4 + 6
8 + 6
14
6 0
4 years ago
Evaluate 2d + 3 when d = 8.
Maslowich

Answer:

19

Step-by-step explanation:

2d+3

2 (8) +3= 16+3= 19

4 0
4 years ago
Read 2 more answers
Possible my last brainliest if its right question idk may be more but this one is harsh for me
adelina 88 [10]
Correct Solution: He read 1.5 pages per minute.


Error Analysis: You should’ve divided 3 by 2 not 300. There are 300 pages in the book total. This information is irrelevant to the question. Cole reads 3 pages in two minutes. So you divide 3 by to to find out how many pages he reads per minute. 3/2=1.5
4 0
3 years ago
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