# Cynthia

Popular questions and responses by Cynthia-
## math

an open box contains 80cm^3 and is made from a square piece of tinplate with 3cm squares cut from each of its 4 corners. Find the dimensions of the original piece of tinplate.

*asked on September 20, 2009* -
## new era

the third term of an AP is 5 while the 7th term is 13,find the 30th term of the AP

*asked on August 11, 2015* -
## math (combination)

A woman has 11 close Friend. Find the number of ways she can invite 5 of them to dinner if a. but where 2 of the friends are married and will not attend separately b. where 2 of the friend will not attend together the answer to a. 210 b. 252 Please

*asked on December 30, 2010* -
## Trig

Find the exact value of tan 5pi/12 using the half-angle identity.

*asked on October 15, 2011* -
## physics

A body of mass 500g suspended from the end of a spiral spring which obeys Hooks law, produced an extension of 10cm. If the mass is pulled down a distance of 5cm and released, calculate 1 the force constant of the spring 2 the frequency of oscillation 3 the

*asked on February 14, 2020* -
## Earth Science

How is the local hydrologic cycle affected by the practice of drawing drinking water from a river and then returning sewage to the same river? Can anyone please help?????? THANKS A LOT!!!!!

*asked on July 20, 2011* -
## Chemistry

What mass of oxalic acid dihydrate , H2C2O4•2H2O, is required to prepare 220.0 ml of a 1.28 M solution of oxalic acid ?

*asked on February 22, 2012* -
## Chemistry

The enthalpy of combustion of benzoic acid is –26.4 kJ/g. What is the enthalpy of combustion expressed in joules per kilogram?

*asked on January 18, 2012* -
## Physics

A 6 µC charge is placed at the origin and a second charge is placed on the x-axis at x = 0.34 m. If the resulting force on the second charge is 4.0 N in the positive x-direction, what is the value of its charge?

*asked on July 14, 2011* -
## Calculus

1. Locate the absolute extrema of the function f(x)=cos(pi*x) on the closed interval [0,1/2]. 2. Determine whether Rolle's Theorem applied to the function f(x)=x^2+6x+8 on the closed interval[-4,-2]. If Rolle's Theorem can be applied, find all values of c

*asked on October 30, 2012* -
## geometry

The circumference of a circle is approximately 28.26 cm. Find its diameter and radius

*asked on November 2, 2010* -
## Chemistry

What is the net ionic equation for the reaction that occures between nitrouse acid and strontium hydroxide ?

*asked on February 22, 2012* -
## physics

You exert a force of 455N in pulling 15.0m of rope using a pulley system to lift a 935N object 5.0m. What is the efficiency of the pulley system? Please help, I appreciate it a lot.

*asked on June 13, 2009* -
## Maths

Find correct to the nearest degree, the angle between p=12i - 5j and q=4i + 3j? I need solvings please?

*asked on June 12, 2019* -
## Math (combination/permutation)

Question 1: There are 12 students in a class. Find the number of ways that 12 studenets can take 3 different tests if 4 students are to take each test. Question 2 Find the number of ways 12 students can be partitioned into 3 teams A, B, C, so that each

*asked on December 30, 2010* -
## physics

a bimetallic compound strip of brass and iron is 10cm long at 20C. When heated over a Bunsen burner flame the temperature of the brass rises to 800C and the iron to 750C. Calculate the difference in lengths of the iron and brass. (Ignore the bending

*asked on April 21, 2009* -
## algebra

kyle's credit bill is $360. kyle sends a check to the credit card company for $70, charges another $109 in merchandise, and then pays off another $231 of the bill. how much does kyle owe the company?

*asked on January 23, 2008* -
## Math (combination/permutation)

Question 1: There are 12 students in a class. Find the number of ways that 12 studenets can take 3 different tests if 4 students are to take each test. Question 2 Find the number of ways 12 students can be partitioned into 3 teams A, B, C, so that each

*asked on December 30, 2010* -
## Chemistry

The melting point of aspirin : 128-137Celsius degree. The melting point of the crude aspirin was measured to be 128 Celsius degree. What does it indicate about the purity of the product?

*asked on December 5, 2010* -
## chemistry

25.0g of 5.0% (by mass) acetic acid solution are titrated with 0.300 M NaOH. What volume of NaOH will be needed to neutralize this sample?

*asked on May 28, 2010* -
## business

Which one of the following questions would be inappropriate to ask during an interview? A. Do you have children of your own B. What do you like best about teaching young children C. What is one science activity that would be appropriate for four-year-olds?

*asked on January 13, 2009* -
## Mathematics

A cone of height 9cm has a volume of n cm3 and a curved surface area of n cm2. Find the vertical angle of the cone

*asked on May 11, 2020* -
## mathvariation! Pls I need help! 2(steve,reiny,reed)pls

the distance covered by a falling ball varies as the square of the time taken.if a ball falls through 1800m in 15seconds,calculate the distance when the time taken is 15seconds and the time taken for is distance of 648m.?

*asked on April 30, 2017* -
## maths

the third term of an AP is 5 while the 7th term is 13 find the 30th term of the AP

*asked on August 11, 2015* -
## Chemistry

If the percent yield was 81.5%, how many grams of aluminum were used to prepare 20.0 g of potassium alum?

*asked on February 29, 2012* -
## Chemistry

The concentration of Pb+2 in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of the wastewater is added an excess of sodium carbonate, forming the insoluable lead(II)carbonate (267.2092 g/mol) according to the

*asked on February 22, 2012* -
## science

Is a gelatin dessert a solution, a suspension or a colloid? I think it is a suspension. Thanks you. The ingredients of gelatin are completely soluble in water and the end product is clear and transparent. It is a solution, in my opinion.

*asked on June 10, 2007* -
## Maths

The second term of a GP is 4, the fifth term is 81, find the seventh term

*asked on March 12, 2020* -
## calculus

A variable force of 7xâˆ’2 pounds moves an object along a straight line when it is x feet from the origin. Calculate the work done in moving the object from x = 1 ft to x = 19 ft. (Round your answer to two decimal places.)

*asked on March 15, 2017* -
## IPC

If the specific heat of water is 1.0 calorie/gram°C, how many calories are required to raise 500 grams of water 10.0°C?

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

Trying to be on time for class, a girl moves at 2.4 m/s down a 52 m-long hallway, 1.2 m/s down a much more crowded hallway that is 79 m long, and the last 25 m to her class at 3.4 m/s. How long does it take her to reach her class?

*asked on September 18, 2012* -
## Calculus

Evaluate (Integral) sin 4x cos^2 4x dx. A. Cos^3(4x)/3 + C B. -Cos^3(4x)/3 + C C. Cos^3(4x)/12 + C D. -Cos^3(4x)/12 + C

*asked on August 4, 2012* -
## Chemistry

A student titrated 1.852 g of a mixture containing potassium hydrogen phthalate, KHP....? A student titrated 1.852 g of a mixture containing potassium hydrogen phthalate, KHP, with 0.163 M NaOH solution. She recorded an initial buret reading of 0.84 mL and

*asked on March 7, 2012* -
## Chemistry

Calculate the volume (in mL) of 9.0M H2SO4 that you would need to convert 0.070 moles of KAl(OH)4 to K2SO4 and Al2(SO4)3 according to the following equation: 2 KAl(OH)4 + 4 H2SO4->K2SO4 + Al2(SO4)3 + 8 H2O

*asked on February 29, 2012* -
## Chemistry

Oxygen has a boiling point of 90K, and nitrogen has boiling point of 77K. Which is a liquid and which is a gas at 80K? I tried to look into the phase diagrams, but I still don't understand. Can somebody please help and explain to me??? THANKS A LOT!!!

*asked on July 10, 2011* -
## finance

A corporation’s pretax net income of $1,000,000 is taxable based on 30% of the first $300,000, 35% of the next $300,000, and 40% of the balance:

*asked on May 26, 2011* -
## Working with Parents

Why must parents be involved in their child's day care program when it's sponsored by the government? A.Parent involvement reduces the cost of day care. B. Parents can judge the abilities of the staff at the center. C. Parent involvement frees the staff to

*asked on March 16, 2009* -
## Child Care Facility

In a child care facility, Kitchen rules are intened to A. promote safety. B.facilitate the preparation of meals. C. discourage the kitchen staff from entering classrooms. D. regulate traffic flow from food preparation areas to eating areas. I pick the

*asked on January 11, 2009* -
## health

What are some common items that use lactose as a filler or as a flavoring agent

*asked on November 8, 2007* -
## Algebra 1

Find the slope of the line passing through the points (–2, 6) and (6,-10).

*asked on September 6, 2007* -
## mathvariation 2(steve,reiny,reed) pls I need help!

the force E needed to make a machine pull a load is partly constant and partly varies as the load to be pulled itself.when the load is 20g,the force needed is 1.4n,where as the force needed for 30g load is 2N. Find the: A)law connecting the load and the

*asked on April 30, 2017* -
## geography

Social effects of poor service delivery.

*asked on May 15, 2016* -
## Math

If no digit may be used more than once, how many 2-digit numbers can be formed using only the digits 5, 6, 3, and 2?

*asked on February 19, 2016* -
## math

bobs monthly phone bill is made up of a 10.00 fee plus $0.05 per min.bobs phone bill for july was 22.00 write an equation to model the situation using m to represent the number of min. solve the bequation to determine the number of phone mins.bob used in

*asked on March 3, 2015* -
## statistics

A study found that 81% of households in the United States have computers. Of those 81%, 92% have Internet access. Find the probability that a U.S. household selected at random has a computer and has Internet access.

*asked on February 7, 2013* -
## Calculus

Evaluate (integral) e^3x dx. A. e^3x + C B. 1/3e^3x + C C. e^4x + C D. 1/4e^4x + C

*asked on August 4, 2012* -
## Trigonometry

Prove that tan (Beta) sin (Beta) + cos (Beta) = sec (Beta) Please explain.

*asked on August 3, 2012* -
## algebra

find the total number of feet of wood needed if the trellis is 8 feet tall and 2 feet wide.

*asked on August 1, 2012* -
## Pre calculus

How do you work this problem? Find the exact value of sin 2u, cos 2u, and tan 2u given that cot u=3 and 180

*asked on May 14, 2012* -
## Chemistry

Determine the molarity of a sodium hydroxide solution? if 37.34 mL of it are required to neutralize 1.922 g of citric acid. balanced equation- 3NaOH(aq)+H3C6H5O7-->3H2O(l)+NaC6H5O7(aq… ***Plesae show steps.

*asked on March 7, 2012* -
## Chemistry

Zn metal was allowed to react with hydrochloric acid to produce hyrdogen gas.This gave a total of 555mL of gas collected over water at 20C and a pressure of 747mm of Hg. How many moles of hydrogen were collected? The vapor pressure of water at 20C is 18mm

*asked on March 5, 2012* -
## Chemistry

why is a water molecule is much more likely to give up a proton than a methane molecule

*asked on October 2, 2011* -
## Calculus

A team has been working to convert diesel-powered cars to run just as efficiently on used cooking oil! They want to compare the mileage and speed of their prototype with that of the diesel-powered car. The prototype is 100 meters south of an intersection,

*asked on August 1, 2011* -
## calculus

Find the average value of the function f(x) = (2x - 5)^2 on the interval [1, 2].

*asked on July 29, 2011* -
## finance

A company began the year with retained earnings of $1,000. Net income for the year was $250, it repaid $350 of its line of credit balance, and it paid dividends to its shareholders of $200. What was the company’s retained earnings at the end of the year?

*asked on May 20, 2011* -
## calculus

An athlete is running around a circular track of radius 50 meters at the rate of 5 meters per second. A spectator is 200 meters from the center of the track. How fast is the distance between the two changing when the runner is approaching the spectator and

*asked on January 11, 2011* -
## chemistry

freezin point of the solution 25.5g c7h11no7s in 1 x 100gh2O (nonionizing solute)

*asked on January 6, 2011* -
## calculus

6.A manufacturer of DVD players has been selling 800 each week at 150$each. From a market survey it is discovered that for each $5 reduction in price, they will sell an extra 40DVD players each week. a)What is the demand function? b)How large a reduction

*asked on November 23, 2010* -
## chemistry

Chlorine dioxide, ClO2, has been used as a disinfectant in air conditioning systems. It reacts with water according to the following equation. ... HCl If 142.0 g of ClO2 is mixed with 33.0 g of H2O, how many grams of which reactant remain if the reaction

*asked on June 29, 2010* -
## com220

I need help with com220 week5 a full-sentence outline

*asked on June 7, 2010* -
## chemistry

If 24.7 of 0.250 M NaOH solution are needed to neutralize 19.8 mL of H2SO4 solution, what is the molarity of the H2SO4?

*asked on May 28, 2010* -
## algebra

I need to find a solution by substitution method

*asked on March 20, 2010* -
## math

the function with the sum of roots of 11 and product of roots is 11 is..? thanks for the help!

*asked on January 31, 2010* -
## physics

calculate the image position and magnification for an object 3cm tall laced in front of mirror with a focal length of 12cm, if the object is placed at 2f... I got: di: 24cm and m=-1 please tell me if this is right.. thank you so much :)

*asked on June 3, 2009* -
## Nutrition of the young child

Why shouldn't unmodified cow's milk be given to an infant under one year old? A.Infants are able to digest only breast milk. B.It contains too much bacteria for young babaies to handle. C.it can cause an upset stomach. D.Most infants are allergic to it. I

*asked on April 4, 2009* -
## Nutrition of the young child

Why shouldn't unmodified cow's milk be given to an infant under one year old? A.Infants are able to digest only breast milk. B.It contains too much bacteria for young babies to handle. C.It can cause an upset stomach D.Most infants are allergic to it. I

*asked on March 28, 2009* -
## physics

two people are pushing a car of mass 2000kg. if they each push with a force of 320N at an angle of 15degrees to each side of the car, calculate the acceleration of the car, assuming no resistance... please help

*asked on March 11, 2009* -
## Financing and Budget

This financial ratio measures the business's liquidity A.days recivable ratio B.average daily rate ratio C.current ratio D.profit margin I chose the letter D.Can someone check my answer

*asked on March 5, 2009* -
## Chid Care

Your bugjet allows you to purchase only one math software packages for your children ages 5-8. Which one of the following packages would probaly be best for this age group? A.ages 4-7 B.ages 6-9 C. ages 7-9 D. ages 6 and up. I chose the letter B and that

*asked on February 5, 2009* -
## Computer Scheduling

Five Computers 9:30-10:00 young toddlers 3 children here 10:00-12:00 older toddlers 4 children here 1:00-3:00 preschoolers 10 children here Scheduling time.Which one of the following statements is true for this schedule. A. The young toddlers aren't

*asked on February 5, 2009* -
## Algebra 1

If the sides of a square are lengthened by 8cm, the area becomes 289cm^2. Find the length of a side of the original square. I do not know how to do this please help me.

*asked on July 3, 2008* -
## Algebra

x^2-5x=-10 =x=5+i sqrt15/2 ,5-i sqrt15/2. CAN SOMEONE CHECK MY ANSWER.

*asked on July 4, 2008* -
## Algebra 1

Example: x^2+3x-5=0 Answer : -3- sqrt 29/2, -3+sqrt 29/2 (exact solutions) Can someone help me put this in three decimal forum

*asked on June 7, 2008* -
## Music

My question is what compositional techniques were used in the 20th century? I have looked everywhere including my book and cannot find compositional techniques defined. Can you give me the definition of compositional techniques and then maybe I can figure

*asked on February 15, 2008* -
## health

1. What organ is the master controller for directing "amino aciduse(it's not a muscle)? 2. What is meant by the term "amino acid pool" and amino acid turnover"

*asked on November 14, 2007* -
## Algebra 1

Write the equation of the line with slope 4 and y-intercept (0,-5).Then graph the line.

*asked on September 17, 2007* -
## Algebra II

quadratic equations Solve: 2x^2-5x=3 2x^2 -5x -3 = 0 (2x + 1)(x -3) = 0 x = -1/2 or 3

*asked on August 10, 2007* -
## chemistry...weird question

on heatin, 0.02mol of the element M reacts with 0.025mol of oxygen gas. What is the empirical formula of the oxide of M? The mole ratio is .025/.02=1.25 or 5/4 So the O2 has a ratio of 5 to one Metal. M4 (O2)5= M>sub>4O10 or writing it in lowest whole

*asked on May 29, 2007* -
## english

Life is full of choices, so I must learn to make good ones. What is your question about this sentence? More on identifying verbs? If so, there are three of them. Tell us what you think, and we'll give you feedback. ?? Cynthia, that is an excellent idea,

*asked on April 19, 2007* -
## Biology

Meiosis and fertilization in sexual reproduction produce among offspring

*asked on April 11, 2020* -
## Science

The Dna is bond with what ?

*asked on December 21, 2019* -
## Physics

the velocity of s stationary wave in a sring is given by te relation V=K^x T^y e^z where k is the constant calculate the value of x and y?

*asked on June 12, 2019* -
## Pengana college of health science and technology

Shown that alpha =3alpha and beta =2alpha

*asked on April 30, 2019* -
## Life orientation

What are the impact of risk behaviour?

*asked on August 18, 2018* -
## CHM101

Alkali metals can be used for all but one of the following

*asked on July 19, 2018* -
## College PHYsics

Felix Baumgartner, an Austrian skydiver, jumped from a balloon at an altitude of 38,963.3 meters, and fell into history. He was in free fall for 4 minutes 19 seconds, and on the way down reached the speed of 1,357.64 km/h What if there had been no air? How

*asked on June 25, 2017* -
## Math

Twice n,less three,equals 5 How do you write it as an equation?

*asked on May 22, 2017* -
## cynthiavariation 2(steve,reiny,reed)pls I need help!

yea! D question was d one u asked me 2 put d first height!

*asked on April 30, 2017* -
## mathvariation 2(steve,reiny,reed)pls I need help!

pls steve I dnt understand! Explain how d alphabets? Wat are they representing?

*asked on April 30, 2017* -
## variation! Steve pls check my solution!!!

what if d maths is done like dx? L=km/h When L=40,m=175,h=286, (skipping the units) 40=k(175)/ 286 K=286(40)/175=2288/35 L=2288/35=250/50 L=114400/8750 L =13.1m

*asked on April 30, 2017* -
## maths

tanks reiny!!! I appreciate!!!

*asked on April 30, 2017* -
## variation

the load which a crame can lift up is directly proportional to the mass and inversely proportional to the height through which the load is to be lifted.if a load of 40 and mass of 175gm is lifted through height of 286m,from what load will be carried

*asked on April 28, 2017* -
## math

the load which a crame can lift up is directly proportional to the mass and inversely proportional to the height through which the load is to be lifted. If a load of 40 and mass of 175gm is lifted through height of 286m from what load will be carried

*asked on April 28, 2017* -
## CHEMISTRY

WHY A CONICAL FLASK CONTAINING A HOT SOLUTION IS NOT TIGHTLY STOPPERED TO PREVENT SOLVENT LOSS DURING COOOLING.

*asked on March 15, 2017* -
## Chemistry

Find the number of miles of calcium chloride 0.44g

*asked on February 16, 2017* -
## Math

The sum of a number and 10 is -10

*asked on November 4, 2016* -
## Math

Carolyn plans to use her 25% employee discount to buy a $39 lamp because she is redecorating her bedroom

*asked on November 1, 2016* -
## Algebra

The sum of a number and 10 is -10

*asked on October 29, 2016* -
## math

The normal to the curve y = ax^1/2 + bx at the point where x = 1 has a gradient 1 and intercepts the y-axis (0,-14). Find a and b

*asked on October 3, 2016* -
## english

Some people have more than 100 and some have none...what am i

*asked on September 15, 2016*