If 25% of a radioactive substance disappeared in 10 years, how long did it take for 60% of the substance to disappear? How many % disappeared in 5 years?

Q: If $5000 is invested at 5% annual simple interest, how long does it take to be worth $6750?

A: We have to find time period where $5000 is invested at the rate of 5% and amount reached to $6750 We…

Q: -. If one bacteria doubles every 45 mins, how many bacteria will be present after half a day?

A: We will find out the required value.

Q: If $5000 is invested at 6% annual simple interest, how long does it take to be worth $7100

A: Given:      Rate of interest = 6%      Principle  = $5000     simple interest S.I = $7100     Time…

Q: How many dollars per millisecond would the federal govt. have to collect to retire the deficit of…

A: Number of millisecond per year 31536×106 ms. Amount of deficit = $1011.   Number of millisecond per…

Q: A certain amount is invested at 9% annual simple interest, and after 11 years, its investment is…

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Q: The half-life of Radium-226 is 1590 years. If a sample contains 300 mg, how many mg will remain…

A: for the half-life, use the formula y=a0.5tp here initial amount is a=300 mg and the half-life is…

Q: The half-life of the plutonium isotope is 24,360 years. If 10 g of plutonium is released into the…

A: It is given that the half-life of the plutonium isotope is 24,360 years. Use formula, an exponential…

Q: The half-life of radium-226 is 1590 years. If a sample contains 200 mg, how many mg will remain…

A: The formula to find the amount of remaining radioactive material is given by the expression: An =…

Q: How much was initially invested if the value of the investment is at P200,000

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Q: A man invested $20,000 into two accounts paying 5% and 10% simple interest per year. If he earned…

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Q: A certain culture of bacteria triples in amount every day. If there are 100 bacteria present during…

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Q: A boat costs $10,800 and decreases in value by 6% per year. To the nearest penny, how much will the…

A: Costs of boat after 7 years is $7003.55 .

Q: A man invested $20,000 into two accounts paying 5% and 10% simple interest per year. If his earned…

A: To find the investment in each account.

Q: Forty grams of a certain radioactive material disintegrates to 16 grams in 220 years. How much of…

A: Radioactive material follows first order kinetics equation - k = 1tlnA0AA0 = Initial amount = 40 gmA…

Q: Researchers recorded that a certain bacteria population declined from 290,000 to 300 in 24 hours. At…

A: Bacteria in 16 hours=?

Q: A pewter bowl is 8 years old, and a silver bowl is 22 years old. In how many years will the silver…

A: Let after x years the silver bowl will be twice the age of the pewter bowl. After x years the age of…

Q: If $5000 is invested at 7% annual simple interest, how long does it take to be worth $7800?

A: Use formula of simple interest

Q: An element with mass 970 grams decays by 27.7% per minute. How much of the element is remaining…

A: Given that, The mass of the element is 970 grams, which decays by 27.7% per minute. To find: How…

Q: The half-life of radioactive cobalt is 5.27 years. If 100 grams of radioactive cobalt is present…

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Q: If $5000 is invested at 6% simple interest, how long does it take this investment to be worth $7700…

A: Given that $5000 is invested at 6% simple interest.

Q: The half-life of Radium-226 is 1590 years. If a sample contains 200 mg, how many mg will remain…

A: Given that - Half Life = t12 = 1590 years.Formula for half life - t12 = ln2kk = ln2t12where,k = rate…

Q: You inherited a house worth $650,000 today. If the value increases by 4% each year, what would the…

A: given: we inherited a house worth $650,000 today. If the value increases by 4% each year, we have to…

Q: what is their combined wealth after five years?

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Q: A bank loaned out $120000 part of it at the rate of 8% per year and the rest at rate of 12% per…

A: topic - percentage

Q: If the population increases by 2.5% per year, what percentage does it change in 5 years?

A: Per year increment rate(r)=2.5%  In n years % change=1+r100n-1

Q: The price of a new $20,000 car today is expected to increase at an average rate of $950 per year.…

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Q: A radioactive isotope, selenium, used in the creation of medical images of the pancreas, has a…

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Q: If 10% of a radioactive substance decays after 33 years. How much will remain after 200 years?

A: Let in starting the radioactive substance = No And after t time it becomes N

Q: the half-life of a drug in the bloodstream is 18h. what fraction of the original drug dose remains…

A: Given the half-life of a drug in the bloodstream is 18h. what fraction of the original drug dose…

Q: A car was bought for $85,000. It was sold 10 years later for $20,500. At what yearly rate did it…

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Q: If18 g of a radioactive substance are present initially and 4yr later only 9g​remain, how much of…

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Q: If $5,000 is invested at 7% annual interest, how long does it take to be worth $6750?

A: Initial amount =P= 5000  Final amount = 6750  So interest =I= 6750-5000= 1750  Interest rate = 7%=…

Q: An

A: Given,element with mass = 510 gramsdecay rate = 26.3% per minuteour aim is to find how much of the…

Q: The half life of a drug in the bloodstream is 14 hrs. What fraction of the original drug dose…

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Q: The half-life of Radium-226 is 1590 years. If a sample contains 100 mg, how many mg will remain…

A: Given half life =1590 years t0=100, time =0t1=50, time =1590t2=25, time = 2(1590)t3=12.5, time =…

Q: The population of a country doubles in 81 yrs. How many years will it be five times as much?

A: Let 'P' be the number of population then dPdt = KP∫dPP =∫ KdtIn P = Kt +c ......(1)When t = 0  ; P =…

Q: If 10% of a radioactive substance decays after 33 years how much will remain after 200 years?

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Q: Student A is 35yrs old now. 3 yrs ago, student A  was 4 times as old as Student B. how old is…

A: Given, student A is 35yrs old and 3 yrs ago, student A  was 4 times as old as student B To find the…

Q: If the population of the country doubles in 50 years, how many years it would triple?

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Q: The half-life of Radium-226 is 1590 years. If a sample contains 500 mg, how many mg will remain…

A: To find the remaining amount after 4000 years.

Q: Suppose Sam makes $75,000 a year while Willie makes $6,500 per month.  Who makes more money per…

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Q: A pitcher is 30 years old, and a vase is 22 years old. How many years ago wasthe pitcher twice as…

A: let x years ago the pitcher twice as old as the vase x years ago the pitcher was (30-x) years old x…

Q: there were 60 grams of carbon-14 initially, how many grams would be remaining after 12 half-lives?

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Q: The half-life of Radium-226 is 1590 years. If a sample contains 200 mg, how many mg will remain…

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Q: A radioactive substance has a half-life of 25 years. If 640 grams of the substance are present…

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Q: If $520 is invested for one year at 13% simple interest, how much interest is earned? The simple…

A: The objective of the question is determine the simple interest.

Q: How much should be invested at 9% to have $1100 at the end of 5.5 years?

A: Topic:- algebra

Q: The halflife of Radium-226 is 1590 years. If a sample contains 500 mg, how many mg will remain after…

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Q: A new car is purchased for \$41,000$41,000 and over time its value depreciates by one half every 3…

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Q: A car depreciates at the rate of 5% every year. If a car costs 650, 000 now, what is its value on…

A: We will solve the problem