The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 190 grams of a radioactive isotope, how much will be left after 3 half-lives? Use the calculator provided and round your answer to the nearest gram. grams

Q: How much water must be evaporated from a 60 oz, 5% saline solution to produce a 20% saline solution?…

A: Given that total is 60oz saline is 5%. so saline be a then a will be 5% of 60…

Q: Find the amount A in an account (to the nearest dollar) after 5 years if dA = rA, A(0) = 800, and…

A: Given: dAdt=rAA0=800A10=1800

Q: A full 225 L tank contains a 15% saline solution. How many litres must be replaced with a 100%…

A:

Q: Recall the formula for calculating the magnitude of an earthquake, M=2/3log(S/S0).  . One earthquake…

A: Magnitude of an earthquake , M=23log SSuMagnitude of first earthquake=3.923log SSo=3.9 -1

Q: You drink a beverage with 120 mg of caffeine. Each hour, the caffeine in your system decreases by…

A: Given: You drink a beverage with 120 mg of caffeine. Each hour, the caffeine in your system…

Q: During a 5-year drought, a lake's water evaporated at an average yearly rate of 1.875%. If the lake…

A: At the end of the draught, remaining water will be

Q: In a certain culture of bacteria, the number of bacteria increased fourfold in 4 hours. How long did…

A: Given problem is :

Q: A wheel makes 25 revolutions per min. How many revolutions does it make per second

A: For 25 revolutions it take 1 min. In order to evaluate the revolution in 1 second first divide given…

Q: In nursing one procedure for determining the dosage for a child is…

A: Given that  dosage of the drug is 384mL.So, adult dosage=384 mL

Q: Solve for x. (Round your answer to four decimal places.) 38 20°

A:

Q: At the first prenatal visit a client weighed 140 pounds. At the second visit the client had a 5 %…

A:

Q: Solve using A = Aoekt The half-life of a substance is 50 years. If 20 grams is present now, how much…

A:

Q: A cup of coffee contains 140 mililigrams of caffeine. If caffeine is eliminated from the body at a…

A: Initial quantity of coffee = 140 mg Elimination rate = 11% per hour

Q: When Ibuprofen is given for fever to children 6 months of age up to 2 years, the usual dose is 5…

A: The usual dose of ibuprofen for children (6 month to 2 years) is 5 mg per kg. We have to determine…

Q: If the half-life of ibuprofen in the bloodstream is 1.9 hours, how much ibuprofen is left in the…

A: In this type of questions formula used generally M=M012n Here M0 is given initial mass or value. M…

Q: When Ibuprofen is given for fever to children 6 months of age up to 2 years, the usual dose is 5…

A:

Q: b. The Mute Swan was introduced from Europe to North 3 America and can live up to 25 years. Its…

A:

Q: One earthquake has a Richter scale reading of 5.1. Another is one-thousandth as strong. What is its…

A:

Q: 11. The speed of a sound wave through liquid glycerol is about 1900 m/s. Which of the following…

A: SOLUTION-

Q: A bacteria culture tripes every 12 minutes. What amount of time does it take for the original amount…

A:

Q: The half-life of Palladium-100 is 4 days. After 16 days a sample of Palladium-100 has been reduced…

A:

Q: o. 5: The speed of light is 186,000 miles per second and the sun, on average is 93 million miles…

A: Here the speed of the light is given and the distance between the son and earth is also given. We…

Q: How much water must be evaporated from a 55 oz, 15% saline solution to produce a 25% saline…

A: We know x% of saline solution or in any other type of solution contains (100-x)% of water.

Q: The recipe for a sheet cake calls for 7 cups of flour and 3 cups of sugar. Suppose you want to make…

A: The proportion for cake is 7 cups flour and 3 cup sugarFor 38 cup flour, to find amount of sugar

Q: When Ibuprofen is given for fever to children 6 months of age up to 2 years, the usual dose is 5…

A: Solution  Given That,  children from the age group of 6 month to 2 years are given 5 mg of Ibuprofen…

Q: The half-life of Palladium-100 is 4 days. After 16 days a sample of Palladium-100 has been reduced…

A:

Q: A car is purchased for $45,000. Each year it loses 20% of its value. After how many years will the…

A: Let x is the time required to loss its value upto $17000.

Q: The weight of a bar of soap decreases by 2.5% e

A: Given: The new bar weight 100 gm.

Q: A colony of bacteria originally contains 200 bacteria. It doubles in size every 30 minutes. How many…

A: Let P= the population of bacteria at time t in hrs with a starting population of 200 bacteria…

Q: A car is purchased for $11,000. Each year it loses 25% of its value. After how many years will the…

A: Given, Purchased Price = $11,000 Loss rate = 25% = 0.25 Reduced Price = $3700

Q: A colony of bacteria originally contains 600 bacteria. It doubles in size every 30 minutes. How many…

A:

Q: Kevin is John's father. Kevin is 51 years old. Three years ago, Kevin was four times as old as his…

A: Ratio and proportion

Q: An inflatable pool has sprung a leak. You place a 1-gallon cup under the leak and find that it fills…

A: Given: Volume of cup is 1 gallon. Time for filling the cup is 140 seconds. The objective is to…

Q: A scored tablet containing 100 mg of drug X is available. A prescription for drug X reads: 50 mg…

A:

Q: Need help

A:

Q: A solution of 300cc contains 35cc of a drug. What is the percent concentration of the drug in the…

A:

Q: A certain radioactive substance has a half-life of 38 hours. Find how long it takes for 90% of the…

A:

Q: A full 225 L tank contains a 20% saline solution. How many litres must be replaced with a 100%…

A: Given that the tank has a capacity of 225 L and it contains 20% saline solution when it is full. Let…

Q: The population of a city is 217,000. The population declines by 2.9% every year, what Will the…

A: Topic:-  exponential decaying function

Q: The population of a new town is increasing at an instantaneous rate of 3.2% per year. How long will…

A: increasing rate = 3.2 % year   formula for population growth    k is growth rate = 3.2 % year

Q: How much water must be evaporated from a 60 oz, 10% saline solution to produce a 30% saline…

A: Original solution contains 10% salt.   Let x be the amount of water to be evaporated.   The…

Q: The half-life of Palladium-100 is 4 days. After 24 days a sample of Palladium-10C mass of 1 mg. What…

A: Given that: Half life, t1/2=4 daysAfter 24 days, sample reduced to 1mg

Q: The half-life of Palladium-100 is 4 days. After 20 days a sample of Palladium-100 has been reduced…

A: The half-life model is given by: A=A012tλ...(1) where, A is the amount of substance A0 is the…

Q: A tablet contains 0.75 milligrams of a medication. A client receives three (3) tablets a day for…

A: Given:A tablet contains 0.75 milligrams of a medication. A client receives three tablets a day for…

Q: It is 461,000,000 miles from Jupiter to the sun. Light travels 186,000 miles per second. How long…

A: The formula for the speed is, speed=distancetime Then, the time is, time=distancespeed The given…

Q: Cara and Jean, working together, can clean the house in 4 hours. Working alone, Jena takes twice as…

A: Let's    Cara's work rate = x hours/house    Jean's work rate= y hours/house

Q: a cup of coffee has 95mg of caffeine. the amount of caffine in your body diminishes by 7% each hour.…

A:

Q: A formula for the normal systolic blood pressure for a man age A, measured in mmHg, is given as P =…

A:

Q: Julio and Darius can paint a room in 6 hours if they work together. If Darius were to work by…

A: Given query is to find the time taken by Julio to complete the task.

Q: ln(a) − 4 ln(b) + 6 ln(c)

A: