A certain radioactive substance has a half-life of 38 hours. Find how long it takes for 90% of the radioactivity to be dissipated? A) 126 hours B) 119 hours C) 116 hours D) 105 hours B

Q: a) If the edge of a cube is increased by 30 percent, by how much is the surface area increased? b)…

A: The surface area A of a cube with edge length x is A=6x2. The volume V of a cube with edge length x…

Q: A trench is 180 ft long and 12 ft deep, 7 ft wide at the top and 4 ft at the bottom. How many cubic…

A:

Q: 22 The fmanufacturer of a new car claims it will use 9 litres of gas per 100 km. How many miles per…

A: We have to find average in miles per gallon.

Q: A heavy rope, 50 ft long, weighs 0.5 lb/ft and hangs over the edge of a building 120 ft high. (a)…

A: (a)  let's solve this two different ways.Physics way - pretend weight is concentrated in center of…

Q: A tank contains 60 kg of salt and 1000 L of wa solution is mixed and drains from the tank at

A: Given: A tank contains 60 kg of salt and 1000 kg of water.

Q: It is estimated that each guest at a party will eat 7/8 pounds of chocolates. How many guests can be…

A:

Q: 1 Counting 15 cu m. of coal to a tonne, how many tonnes will a coal bin 6 m. long, 6 ft. wide, and 9…

A:

Q: ngh ht trhangles to sc pelow

A: Given: To find : The value of x:

Q: calculate the concentration of a solution in percentage by mass prepared by dissolving 10g of…

A: 10grams of solute is dissolved to get 11g of solution That means the solvent is 1 gram Therefore the…

Q: A cone shaped storage container holds a photographic chemical. If the container is 100 cm wide 30 cm…

A: The volume of cone is given by:                      V = 13πr2h…

Q: How many outs are there in a baseball game that lasts a full 10 innings?

A:

Q: 2. How many gallons of a plant food that  is 9% nitrogen must be combined with smother plant  food…

A: Given information:

Q: How much dirt is there in a hole 13 meters long, 7 meters wide and smeters deep? There are o cubic…

A:

Q: How much dirt is there in a hole 11 meters long, 7 meters wide, and 5 meters deep?

A: Find the amount of dirt is there in hole.

Q: How much does EZ Excavation charge for hauling away 30 cubic yards of dirt?

A: Here we have,  Dirt (Cubic yards) Cost (In dollar)  8 196 20 490 26 637

Q: A farmer has a total yield of 72,000 bu of corn from a 450 acre farm. What total yield should he…

A:

Q: The most powerful light microscope provide only enough magnification to view objects larger than 200…

A: According to SI unit of conversion ;

Q: A heavy rope, 50 ft long, weighs 0.7 lb/ft and hangs over the edge of a building 150 ft high. a)…

A: Given that: Length of rope=50 ft. weight is changing =0.7 lb/ft Height of building  = 150 ft. a…

Q: A balloon 30.7 m in radius is to be filled with helium. How many m3 of helium are needed to fill it?

A:

Q: Calculate the (a) BMI, (b) IBW and (c) estimated energy needs for a 48 year old male who weighs 78…

A: Given that the male is of 48 years old and weights 78 kg is 185 cm tall The objective is to find the…

Q: Consider a cloudless day on which the sun shines down across the United States. If 2949 kJ2949 kJ of…

A:

Q: If a city water supply has a limit of 250 ppm of nitrate ion, what is the maximum amount of nitrate…

A: Given: A city water supply has a limit of 250 ppm of nitrate ion. Find the maximum amount of nitrate…

Q: Assume that in 2015, the average American (18 and over) ate 5.46 lbs. of food per day. How many…

A: It is given that the average American ate 5.46 lbs. of food per day. Convert the 5.46 lbs. to grams…

Q: A ball returns two-thirds of its preceding height on each bounce.  If the ball is dropped…

A: Here, the ball is dropped from a height of 6 m., it will rebound to a height of 23rd of initial…

Q: how many 5-ml doses of liquid medicine can be given from a vial containing 3 deciliters?

A: Recall the following unit conversion.

Q: a square piece of cardboard is o be used to form a box without a top by cutting off squares, 3 cm on…

A: Let 'x' cm be the length of the square from which 3 cm on a side from each corner is cut  Given…

Q: A biologist observes that a certain bacterial colony triples every 4 hours and after 12 hours…

A: Let Pt be the population at time t. Then, Pt=P0ekt. In our case, at t = 4 hours, P4=3·P0. That…

Q: 3. What did the field in Figure 5-3 cost if it sold for $6,225 per acre? 4,225 ft 1,800 ft 5,000 ft

A: Area=sum of bases2* height

Q: le Smh Odo Cost 7 Siut dt

A: We have to integrate the given expressions.

Q: 59 T. MZRPS = %3D 201

A:

Q: When the plutonium bomb was tested in New Mexico in 1945, approximately 1 gram of matter was…

A: Given query is to find the energy released.

Q: A garnet has a density of 3.5 grams per cubic centimeter and a volume of 1.6 cubic centimeters. What…

A: Topic- volume and surface area

Q: 1. find the dimenstors of a maximum Lwithout a top of capacity, 108 sq. cm. box who de Sunface area

A:

Q: 16. Assume that in 2015, the average American (18 and over) ate 5.46 lbs. of food per day.• How many…

A: There are 365 days in a year.  Given that the average American (18 and over) ate 5.46 lbs. of food…

Q: 1. If a.gum drop weighs m of a pound, how many gum drops are in one pound?

A: Topic = Algebra

Q: If the work required to stretch a spring 1 ft beyond its natural length is 12 ft-lb, how much work…

A: From  the given problem:   w=12 ft-lb   From the expression of work done:   w=∫xixfFxdx   From the…

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: There is an order to infuse normal saline at 25 drops per minute and a tubing set that says there…

A: Given, Flow rate = 25 drops/min Drop Factor = 15 drops/ml Volume = 1 liter              = 1000 ml

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

A:

Q: If 2L of solution needs to be administered through an IV over 24hours, then how many mililitres of…

A:

Q: 4. The water in a hemispherical bowl, 42 cm across the top, is 9 cm deep. How much more water is…

A:

Q: If 12 doses of 1½ml are taken from a bottle that contains 40ml , what will be the remaining…

A:

Q: How many grams of boric acid crystals are needed to prepare 350mL of a 4% boric acid solution?

A: A percent is just the hundredth fraction of something and is represented by the symbol %. Therefore,…

Q: Assume no loss of material in cutting. How many pins will you get?

A:

Q: At average rates, how long would it take to completely remove 15 cm of soil? 8.

A: Given-    Average rate of cropland  erosion =6mm decade         Average rate of soil formation…

Q: The country withe the greatest population density is Monaco, where approximately 32,500 people live…

A: Given, in Monaco 32,500 people live in an area of 1.95 square kilometer.

Q: C. A circular swimming pool has a diameter of 6 m, the sides are 1.5 m high, and the depth of the…

A: Use formula of work done

Q: If the work required to stretch a spring 3 ft beyond its natural length is 12 ft-lb, how much work…

A:

Q: 1: How many millilitres of a concentrated acid would need to be added to 30 ml of 20 % topical acid…

A: