If 8 g of a radioactive substance are present initially and 4yr later only 4.0g​ remain, how much of the​ substance, to the nearest tenth of a​ gram, will be present after ​9yr?

Q: What is the magnitude in the Richter scale of an earthquake that released 10 joules of energy? (5

A: Direct use the formula of Richter Scale and substitute the given values then simplify.

Q: According to the recommended safety ratio of 4:1, how high will a 44-foot ladder reach when placed…

A: Safety ratio is 4:1  means  a = 4x  and  b = x And length of ladder is 44 foot We have to find…

Q: How many moles of K are formed from 81 grams of KCI?

A: Given weight of KCl = 81 gm Now atomic weight of K = 39.10 g/mol Atomic weight of Cl = 35.45 g/mol

Q: 12 On a 1:50000 Ordnance Survey map, Winchester covers an area of roughly 70 cm². Roughly what area…

A:

Q: If a diabetic patient injects 20 units of insulin twice daily, how many days will a 10-mL vial of…

A:

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

A: Given problem is :

Q: How much carbon dioxide emissions will youcause by using your 250 watt laptop for 3 hours? Express…

A:

Q: How many ft are in 140 yd? (Round your answer to exactly three significant digits when necessary.…

A:

Q: How many millilitters are contained in a 16oz bottled of water?

A: Recall:   1 oz=29.57 milliliters

Q: If a solid weighs 95.6 g in air, 75.8g when immersed in H2O, what is its sp.gr?

A: Specific gravity =density of the object density of water

Q: 2.11. Compare 2.3451 kg with 2345.12 g. Which is the greater mass?

A:

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: Which is larger, 1/2 ln 16 or 1/3 ln 27? Explain

A: 12ln16=ln1612    ∵y·lnx=lnxy=ln4 & 13ln27=ln2713    ∵y·lnx=lnxy=ln3

Q: A small metal bar, whose initial temperature was 20° C, is dropped into a large container of bowling…

A: Let T(t) be the temperature of the bar after t time Given that T(0)=200C T(1)=220 C

Q: If your front lawn is 15.0 feet wide and 20.0 feet long, and each square foot of lawn accumulates…

A:

Q: How many mL of a 0.7% solution can be made with 4mg of a drug?

A: A percentage is just a hundredth fraction of anything and it is represented by %.  Therefore, 1%…

Q: If 120 ml of water fills of another cylinder shaped like the one shown, how many milliliters will of…

A:

Q: Everything related Calculate volumes of revolution

A: Solution is given as below:

Q: The half-life of the radioactive element krypton-91 is 10 seconds. If 16 grams of Question…

A: Given: Half life of Krypton-91 = 10 seconds Initial amount of Krypton-91 = 16 gm We have to find how…

Q: In how many days will $4,500 grow to $4,845.21 at 7% p.a.?

A:

Q: An automatic screw machiene is capable of producing one piece in 0.02minute. How many pieces can be…

A: According to the given information, it is required to calculate the number of pieces produced in…

Q: When Charles was born, his father was 25 vears old. Five years ago, ete ratio of Charles' age to…

A: Let present age of Charles is x years. Then present age of Charles' father is x+25 years. Now Five…

Q: What is the capacity for the container? (Give your answer to the nearest tenth of a liter.) L

A: Using volume formula

Q: to a mass of 4 mg. What was the initial mass (in mg) of the sample? What is the mass 8 weeks after…

A:

Q: In 100 yrs, 132mg of radium decomposes to 96mg. How many mg will be left after 200 yrs?

A:

Q: (1) Suppose you lift a stone that has a mass of 5.1 kilograms off the floor onto a shelf that is 2.5…

A: "Since you have asked multiple questions. We will solve the first question for you. If you want any…

Q: A patient is required to take 120 mg daily how many grams of this drug will the patient take in five…

A:

Q: Estimate 18 = e" using a table of values. Oz R 1.5

A:

Q: A boat is travelling due west at a speed of 47miles per hour. If the boat started off 170miles…

A:

Q: 1. A cola bottle holds 1.21. Glasses hold 75ml. How many full glasse could be poured from the…

A: A cola bottle holds 1.2 litre Glasses holds 75ml

Q: 1. Afope 33 cm long has a mass of 561 g What is the mass of 13 cm of this rope?

A: As per our guideline if multiple questions are posted where supposed to answer only the first one.…

Q: (3) If 0.5 ml of mumps virus vaccine contains 5000 units of antigen, how many units would be present…

A: Given, 0.5 ml of mumps virus vaccine contains 5000 units of antigens Volume of the vaccine after…

Q: A prescription calls for 0.3 g of phosphoric acid with a sp gr of 1.71. How many mL should be used…

A: Given- A prescription calls for 0.3 g of phosphoric acid with a sp gr of 1.71. To Find- The quantity…

Q: If a drug has a concentration of 3.04 mg per 1.423 mL, how many mL are needed to give 2.651 gram of…

A:

Q: If one earthquake is 30 times as intense as another, how much larger is its magnitude on the Richter…

A: I have provided solution in step2.

Q: A client is prescribed to receive 4 t of a medication every 4 hours. How many ounces of the…

A:

Q: 4. How many revolutions will a car wheel of diameter 30 in, make over a period of half an hour if…

A:

Q: How many nanoliters are in 1.80 x 10-10 L?

A: Since you have asked multiple questions in a single request, we would be answering only the first…

Q: A biologist observes that a certain bacterial colony is multiplied by 4 every 7 hours and after 28…

A: a) Area occupied by the colony when first observed:  Area occupied by the colony when first observed…

Q: What is the annual fuel cost for a car driving 26,000 km per year with a fuel rating of 9.7 L/ 100…

A:

Q: A cone-shaped water reservoir is 28 ft in diameter across the top and 21 ft deep. If the reservoir…

A: The work done is the product of force and displacement. The force can be written as the product of…

Q: a) How many cubic centimeters of water will a rectangular fish tank hold if the tank is 70 cm long,…

A:

Q: How many items costing 34 k can be bought with N85.00 ?

A: We have to find no of items

Q: a magnificaton is scaled so that 3.5" on it equals .1" in actuality. So a measurement on it of 3/16"…

A: Given:

Q: How many 14-milliliter doses of liquid medication can be given from a vial containing 28 deciliters?

A:

Q: been reduced to a mass of 2 mg. What was the initial mass (in mg) of the sample? What is the mass 5…

A: Let us use the law of radio active decay to solve the problems

Q: Suppose you use 260 fl ozs of liquid laundry detergent every 13 weeks. How much liquid detergent  (…

A: It is given that, In every 13 weeks the quantity of liquid detergent used=260fl ozs And according to…

Q: A nurse is caring for an adolescent client who has pneumonia and a pescription for cefpodoxime…

A:

Sequence and Series

A sequence is defined as a collection of things. Series is defined to sum the things one by one in the sequence.  It was invented by German mathematician Carl Friedrich Gauss.