# Charles

Newest questions and responses by Charles-
## social studies, slaves, industrial revolution

Give an example of how being able to communicate over long distances would help Americans(using morse code)

*asked on February 11, 2019* -
## logarithm, precalculus, algebra 2

how do you solve logarithms with log in the exponent?

*asked on February 11, 2019* -
## physics

If a man weighs 600 N on the Earth, what would he weigh on Jupiter, where the free-fall acceleration is 25.9 m/s2?

*asked on February 10, 2019* -
## Literature, History, Government, French

Explain 5 measures that the government of Ghana is taking to promote science education in Ghana

*asked on November 21, 2018* -
## science

A family in Virginia drove to California. The first day, they traveled 400 miles in 8 hours what is their velocity?

*asked on November 19, 2018* -
## English 12

One goal of America Recycles Day is to raise awareness of the growing landfill problem. Which of these phrases is the complete infinitive phrase in the sentence?

*asked on November 6, 2018* -
## MATH

Which ordered pairs are on the line 4x−3y=84x−3y=8 ? Select each correct answer. (−1,4) (1,−4/3) (3/2,−2/3) (−4,−8) I know that one is (1,4/3) but I thought the other was (2,0) and it is not up their. Help

*asked on January 19, 2018* -
## Chem

The brilliant color of fireworks is produced by shells containing lithium carbonate (Li2CO3) that are launched into the night sky and explode. The explosions produce enough energy to vaporize the Li2CO3 and produce excited state lithium atoms. These atoms

*asked on December 13, 2017* -
## math

How many terms of the arithmetic sequence 88, 85, 82, . . . appear before the number -17 appears?

*asked on July 20, 2017* -
## math

A girl starts from point A and walks 285m to B on a bearing of 078.She then walks due south to a point C which is 307m from A. What is the bearing of A from C,and what is {BC}? please i need the answer urgent ooo it is an assignment pls help me fast

*asked on May 18, 2017* -
## math

A man walks due west for 4km. He then changes direction and walks on a bearing of 179 until he is south-west of his starting point.How far is he then from his starting point?

*asked on May 17, 2017* -
## English

Two types of biographies are: a. Formate and genre b. Poetry and prose. c. Fiction and nonfiction. d authentic and fictionalized

*asked on May 4, 2017* -
## Chemistry

How do you prepare 17.2cm³ of 36% conc HCL per dm³ of solution?

*asked on April 1, 2017* -
## math

The length by the width of Roxie's photo is 24 cm long and 14 cm wide. In order to make a photo that will fit into a wallet, the photo needs to be reduced to a length of 7 cm. Determine the width of the wallet size photo.

*asked on January 30, 2017* -
## math

The mean of Alice's last 5 math test scores is 88. The first 4 of these 5 math test scores were 87, 75, 93, and 85. What score did Alice earn on her fifth math test?

*asked on January 27, 2017* -
## Math

A parking garage charges $2.00 to enter the garage and $1.50 an hour to park. Use the coordinate plane to graph this situation.

*asked on January 23, 2017* -
## chemistry

a gas occupies a volume of 50.0mL at degrees Celsius and 630mmHg.at what temperature in degrees Celsius would the pressure be 101.3kPa if the volume remains constant?

*asked on December 19, 2016* -
## geometry

Determine the Cartesian form of the equation r^2 cos theta -cos3theta

*asked on November 29, 2016* -
## Chemistry

What is the morality of a solution prepared by dissolving 10.60g of sodium trioxocarbonate (v) in enough distilled water to obtain 250.0 ml of a solution?

*asked on November 21, 2016* -
## Physics

A certain number of identical resistors are connected in series and their total resistance is measured. When the resistors are disconnected and re-connected in parallel, their total resistance drops to one-percent of the value measured when they were

*asked on November 7, 2016* -
## math

two strips of fabric measure 14 2/3 inches and 20 7/8 inches in length. to form one length, the strips are sew together using 3/8 inch from each strip to make the seam. what is the final length of the fabric after the two strips are sewn together.

*asked on October 20, 2016* -
## Math

How many times does a palindromic number appear on a 12 hour digital clock between 12 midnight and 12 noon?

*asked on October 18, 2016* -
## Chemistry

The atomic mass of CU 63 is 62.9296 amu with a natural abudance of 0.692. The average mass of copper is 63.546amu.What is the mass of copper's other isotope?

*asked on October 9, 2016* -
## Statistics

Bill,mary,and Joe belong to a club of nineteen people. A committee of twelve is to be selected at random from the membership. How many different arrangements are possible? How many of these committees will contain Bill,Mary, and Joe at the same time?

*asked on September 29, 2016* -
## Statistics

Bill, Mary, and Joe belong to a club of nineteen people. A committee of twelve is to be selected at random from the membership. How many different arrangements are possible. How many of these committees will contain Bill, Mary and Joe at the same time?

*asked on September 29, 2016* -
## Statistics

Two committees, one with six and one with seven people, are to be selected from a group of eighteen people, with no one person serving on both committees at the same time. In how many ways can this be done?

*asked on September 29, 2016* -
## Science

A 0.5kg mass connected to a light spring of constant 20N/M occilates on a frictionless track. Calculate the total energy of the system

*asked on September 23, 2016* -
## Math

3. The population of Columbus, Ohio, in 2014 was about 823,000. The population of the United States was about 319 million in 2014. (a) Write each population in scientific notation. (b) About how many times larger was the population of the United States

*asked on September 20, 2016* -
## probability statistics

A jar contains 6 red, 7 white, and 7 blue marbles. If a marble chosen at random. Find the following probabilities? A)P(red) B)P(white) C)P(red or blue) D)P(red and white)

*asked on August 10, 2016* -
## math

In isosceles right triangle ABC, point D is on hypotenuse BC such that AD is an altitude of triangle ABC and DC = 5. What is the area of triangle ABC?

*asked on July 7, 2016* -
## Chemistry

What volume of 1.0 M NaOH must be added to 1.5 L of 1.20 M CH3COOH (ka=1.8x10^-5) to make the solution a buffer for pH 4.50? I do not understand how to determine the mols of NaOH. I tried to use the equation where: [H3O+] = ka (nHA/nA-) but it is not

*asked on April 10, 2016* -
## math

I need help making this question into a equation? A cable television company charges $15 plus $5 each for extra services and now write an equation to show how much a person would pay for television if they had x number of extra services?

*asked on April 5, 2016* -
## chemistry

A 0.109g sample of a pure gaseous compound occupies 112ml at 100degrees and 750torr: what is the molecular weight of the compound. ANS=(30.2g,mol). Please I need the solution

*asked on March 21, 2016* -
## Physics

A man walks 3km E and then 4km N. What is his resultant displacement?

*asked on March 8, 2016* -
## Physics

An airplane is heading 20degree north flying at 200km/hr relative to the air. Simultaneously the wind carries the plane 10degree, east of south at the speed of 60km/hr. (a) find the velocity of the plane relative to the ground. (b) find the component (east

*asked on March 8, 2016* -
## Physics

Find the vector cross product of two vectors C=2i-j and D=i+2j-3k. What is the angle between the vectors

*asked on March 8, 2016* -
## Physics

Find the magnitude of the dot product of the two vectors B=6i+j+2k, D=-1+3j. What is the angle between B and D

*asked on March 8, 2016* -
## Physics

Consider two vectors one of magnitude 3 and the other 4 unit, which of the following is not correct? We can combine these vectors to yield a resultant of. A.7 B.5 C.1 D.0

*asked on March 8, 2016* -
## Physics

If D=7i-3j+2k and E=4i+5j-3k. Deduce angle between D and E

*asked on March 8, 2016* -
## Physics

If D=7i-3j+2k. Find the magnitude of D

*asked on March 8, 2016* -
## Physics

If D=7i-3j+2k and E=4i+5j-3k. Find the scalar product of D.E

*asked on March 8, 2016* -
## Physics

Find the sum of vectors A=5m

*asked on March 8, 2016* -
## Thermodynamic

One mole of CO2 is to be compressed adiabatically from 1 bar and 25 C. Because of irreversibilities and poor design of the compressor the compressor work required is found to be 25 %greater than that for a well-designed (reversible) compressor. Compute the

*asked on March 8, 2016* -
## Physics

A body is projected such that the horizontal range is twice the maximum height of projection. Find the angle of projection; and the time of flight if the velocity of projection is 5m/s

*asked on March 7, 2016* -
## Physics

What is the total time of flight of an object projected vertically upwards with a speed of 30m/s? (g=10m/s^2

*asked on March 7, 2016* -
## physics

the surface tension Y, of liquid depends on the density,P, acceleration of gravity,g, and the height, h. use the method of dimension to derive the actual relationship between these quantities

*asked on March 7, 2016* -
## physics

a sphere of radius r moving with velocity v through a fluid experiences a retarding force f given by F=6r^yv^zn^x where n is the viscosity of the liquid. use the method of dimensions to find the values of x,y,and z.

*asked on March 7, 2016* -
## Physics

A brass cube 2cm on each edge is held in the jaw of a wire with a force 1600N. By aw much is the cube compressed. (Y for brass is 9.1×10^10pa)

*asked on March 6, 2016* -
## physics

The vertical and horizontal component of the initial velocity of a projectile are 36m/s and 64m/s. Find the initial velocity and angle inclination

*asked on March 6, 2016* -
## maths

A contractor supplied some items to a school. The contractor's bill is shown below. If each amount includes 5% VAT calculate how much the government receives as VAT. Electrical fittings = #52 500.

*asked on March 5, 2016* -
## maths

A rectangle of length y m and breadth 4 m less than the length. What is the perimeter??

*asked on March 4, 2016* -
## math-finance

suppose you are offered two identical jobs: one paying a starting salary of $40,000 with yearly raises of $2,000 and one paying a starting salary of $36,000 with yearly raises of $25,000. Which job will pay more over a 10 year period? I=PRT = 40,000 x 0.05

*asked on February 26, 2016* -
## math

How do find determine fractions from the greatest to least

*asked on February 22, 2016* -
## physcis

a girl throws a ball vertically upward with a speed of 20 ft/sec from the roof of a building 60 ft high.(a)how long will it take the ball to reach the ground? (b)what will its speed be when it strikes the ground?

*asked on February 21, 2016* -
## math

jane gets 1/2 of a gold star each time she helps her teacher clean up the classroom after class. How many times would Jane need to help her teacher to earn 3 whole gold stars? Draw fraction. Strips to help.

*asked on February 5, 2016* -
## Programming Logic and Design

Design an application that accepts eight friends' first names and displays them in alphabetical order

*asked on December 3, 2015* -
## derivrtives

Find the derivative of d^2Y/dx^2 of y=e^2t and x=cost^2 and leave your answer in terms of x and y

*asked on November 25, 2015* -
## math

Air is pumped into a spherical balloon at the rate of 20cm^3/s^-1.find the rate of change of radius of the balloon when the radius is 6cm

*asked on November 25, 2015* -
## probability theory

3 students; A, B and C, are in a swimming race. A and B have the same probability of winning and each is twice as likely to win as C. Find the probability that B or C wins the swimming race. 3) Given three boxes as follows: Box A contains 3 red, 2 white

*asked on November 20, 2015* -
## chem

How would your experimental formula of magnesium chloride “MgClx” have been affected if your product was not dried completely before weighing it? Would “x” be too high or two low?

*asked on October 28, 2015* -
## Biology

Some people experience “heartburn” when eating fatty, greasy foods (similar to the effect that is felt when eating acidic foods). Why would this occur with fats? I know fatty acids are made of carboxylic acid and if you have too much, would it make

*asked on October 27, 2015* -
## PHYSICS

An automobile accident causes both the driver and passenger front airbags to deploy. a. If the vehicle travelled at a speed of 88.6 km/h is now at rest, find the change in momentum for both the 68.4 kg adult driver and the 34.2 kg child passenger. b. The

*asked on October 24, 2015* -
## Combinations and Permutations

A committee of 3 members is selected from a club made up of 10 junior members and 20 senior members. What is the expected number of juniors in the committee?

*asked on October 4, 2015* -
## Science

The solubility of a compound in water is 6.8g/100ml at 25°C.. Calculate the amount of water required to crystallize 10g of the compound. If the pure compound is collected at 25°C what is the maximum possible yield percent.

*asked on September 21, 2015* -
## life science

investigation to determine whether expired air contains carbondioxide

*asked on September 6, 2015* -
## Math

A toy company manufactures miniature cars. They sell miniature sports cars in a box. They sell 12 miniature trucks in a box. Mrs. Murphy wants to buy an equal number of sports cars and trucks for the Boys and Girls Club. What is the least number of

*asked on August 16, 2015* -
## maths

A box contains 5 red bowls, 6 yellow bowls and 3 white bowls. If 4 bowls are randomly drawn from the box at the same time, (a)find the probability that exactly 2 red bowls are drawn; (b)find the probability that at least 2 red bowls are drawn.

*asked on July 23, 2015* -
## math

A box contains 5 red bowls, 6 yellow bowls and 3 white bowls. If 4 bowls are randomly drawn from the box at the same time, (a)find the probability that exactly 2 red bowls are drawn; (b)find the probability that at least 2 red bowls are drawn. My work: (a)

*asked on July 22, 2015* -
## physics

consider a vertical piston system. the piston has a 50g mass and a given radius of 3mm. what amount of pressure does the piston exert? ( use g==9.8 m/s^2 )

*asked on June 2, 2015* -
## math

what is the surface area of a cube with sides measuring 2 inches?

*asked on May 14, 2015* -
## Managerial Economics

1. A principal-agent problems occur when managerial decisions are not consistent with the firm's shareholders' interests. T 2. A firm making more than a normal profit may still be experiencing an economic loss. T 3. An inferior good is a good whose demand

*asked on May 13, 2015* -
## english

Choose the correct sentence pattern for the sentence below. I hereby declare Tuesday Shakespeare Day.

*asked on April 19, 2015* -
## Chemistry

What volume of carbon tetrachloride (density = 2.71 g/mL) contains 2.46x10^25 chlorine atoms? I did: 2.46x10^25 Cl atoms x 1 atom/4 atoms x 1 mol/6.02x10^23 x 154 g/1 mol x 1 mL/2.71 g And the correct answer is apparently 572 mL when I got 581 mL.

*asked on March 29, 2015* -
## Chemistry

What volume of carbon tetrachloride (density = 2.71 g/mL) contains 2.46x10^25 chlorine atoms?

*asked on March 29, 2015* -
## Chemistry

If 84.1 g of sodium hydroxide are reacted with 51.0 g of aluminum in the following equation: 2NaOH + 2Al + 2H2O --> 2NaAlO2 + 3H2 a) what mass of excess reactant remains? b) what mass of water would react?

*asked on March 28, 2015* -
## Physics

A baseball player leads off the game and hits a long home run. The ball leaves the bat at an angle of 30.0o from the horizontal with a velocity of 40.0 m/s. How far will it travel in the air? Working out please

*asked on March 17, 2015* -
## Maths

e) A fair coin is tossed 6 times. What is the probability of getting exactly 2 heads? What is the mean of this experiment?

*asked on February 7, 2015* -
## Math

I have 14 hundreds, 16 tens and 9 ones. What number am I?

*asked on February 4, 2015* -
## Math

The winner of a raffle will receive 3/4 of the 530.40 raised from raffle ticket sales

*asked on January 22, 2015* -
## Math

Delia has 493 stamps in her stamp collection. She can put 16 stamps on each page of an album. How many pages can she fill completely?

*asked on January 21, 2015* -
## GRANTHAM

Find the present value of the ordinary annuity. Please round the answer to the nearest cent.$2,000 per semiannual period for 7 yr at 12%/year compounded semiannually

*asked on December 30, 2014* -
## Math

The denominator of a fraction is one more then the numerator. If 2 were added to both the numerator and denominator, the new fraction equals 4/5. Find the original fraction.

*asked on December 18, 2014* -
## Cardiovascular Respirtory

In which condition is the patient most likely to hemorrhage? A. Thalassemia B. Erythroblastosis fetalis C. Thrombocytopenia D. Polycythemia

*asked on December 17, 2014* -
## physics

A 75-g piece of aluminum at 89 °C is dropped in 1.0 L of water at 1.3 101 °C, which is in an insulated beaker. Assuming that there is negligible heat loss to the surroundings, determine the equilibrium temperature of the system

*asked on December 8, 2014* -
## math

Gina's art teacher mixes 9 pints of yellow paint with 6 pints of blue paint. Did Gina use the same ratio of yellow paint to blue paint instructed by her teacher.

*asked on December 7, 2014* -
## math

taryn and alastair both mow lawns. Each charges a flat fee to mow a lawn. The table shows the number of lawns in the past week, the time spent mowing lawns and the money earned. Taryn mowed 9 lawns. She spent 7.5 hrs mowing lawns. Taryn earned $112.50

*asked on December 3, 2014* -
## math

1/3 / 7/9 =1/3 * 9/7 =9/21 is this right??

*asked on November 23, 2014* -
## math

1 3/5 - 5/6 =8/5 - 6/5 =2/5 or is it =1/3/5 - 5/6 =48/30 - 25/30 =23/30 I don't know which one is right. Pleas e help!

*asked on November 23, 2014* -
## math

3/8 + 2 1/2 =3/8 + 5/2 =8/10 =4/5

*asked on November 23, 2014* -
## math

5/7 *9/10 =63/70 =9/10

*asked on November 23, 2014* -
## math

5/7 * 9/10 = 50/70 * 63/70 =3150/70 =45

*asked on November 23, 2014* -
## math

4/5 * 3/4 = =16/20 * 15/20 =240/20 =12 is this right?

*asked on November 23, 2014* -
## math

A jar contains 133 pennies. A bigger jar contains 1 2/7 times as many pennies. What is the value of the pennies in the bigger jar

*asked on November 23, 2014* -
## Advanced Finance

6. (TCO F) Suppose the December CBOT Treasury bond futures contract has a quoted price of 80-07. What is the implied annual interest rate inherent in the futures contract? Assume this contract is based on a 20-year Treasury bond with semiannual interest

*asked on November 21, 2014* -
## decimals

Mark wants to paint a mural. He has 1 1/3 gallons of yellow paint, 1 1/4 green paint, and 7/8 gallon of blue paint. mark plans to use 3/4 gallon of each paint color. How many gallons of paint will he have left after painting the mural?

*asked on November 18, 2014* -
## math

Melina walked her dog 2 1/5 miles. Cathy walked her dog 1 3/4 times as far as Melania did. How many more miles did Cathy walk her dog?

*asked on November 15, 2014* -
## Physics

A 1000 kg Toyota, initially traveling at 40 mph, collides into the rear end of a 2000 kg Cadillac, initially stopped at a red light. The bumpers lock and the two cars skid for 2 seconds before coming to rest. Calculate the coefficient of kinetic friction

*asked on November 2, 2014* -
## math

In order to pass a physical education class at a university, a student must run 1.0 mi in 12.5 min. After running for 10.0 min (assume constant speed), she still has 510 yd to go. What constant acceleration does she need over the final 510 yd in order to

*asked on September 14, 2014* -
## Physics

You are given vectors A = 5.0i - 6.5j and B = -2.5i + 7.0j. A third vector C lies in the xy-plane. Vector C is perpendicular to vector A and the scalar product of C with B is 15.0. Find the x and y components to vector C. Answer key shows x component is

*asked on August 30, 2014* -
## chemistry

In the combustion of hydrogen gas, hydrogen reacts with oxygen from the air to form water vapor. If you burn 54.8 g of hydrogen and produce 4.90 × 102 g of water, how much oxygen reacted?

*asked on August 29, 2014*