# Posts by John

Total # Posts: 8,394

Math
If the radius of a circle is increased by 1 unit, the area of the circle is increased by 16 pi square units. What is the radius of the original circle?

math
The point (-3,4) is on a circle with its center at the origin. Which of the following points must also be on the circle?

Trigonometry
Your horse on a merry-go-round is 18.3 m from the center. Suppose the merry-go-round makes 12.4 rev per ride. If you take 3 rides, through what angle do you move and how many meters do you travel?

Trigonometry
Your horse on a merry-go-round is 18.3 m from the center. Suppose the merry-go-round makes 12.4 rev per ride. If you take 3 rides, through what angle do you move and how many meters do you travel?

english
Thank you Menna!

math
A group of 21 people went to the country fair with 9 people on a stagecoach and 3 people in each buggy. On the return trip, 4 people rode in each buggy. How many people returned on the stagecoach?

math
In a Sing Thing, the first 4 singers sand song 1, the next 4 sand Song 2, and so forth. Song number 73 sang Song? A. 18 B. 19 C. 20 C. 73 I got 15 but I don't know.

math
THANKS

math
To the nearest 1%, what percent of the 12 months have 31 days? A. 75% B. 70% C. 58% D. 50%

math
If ray BD bisects right angle ABC, the measure of angle ABD is?

Precalculus
Let a and b be real numbers. Describe the graph of r = a(cos(theta)+b) as much as possible. (The intent of this question is to get as specific a description as possible that holds for all possible values of a and b. For example, if the question was to describe the graph of x^2...

math
The ratio of boys to girls in a class room was 9:8. Half of the girls left the classroom, and then there were 15 more boys than girls. A. How many children were in the classroom in the beginning B. How many girls left the classroom?

math
The base of a triangle is 11. The other two sides are integers and one of the sides is twice as long as the other. What is the shortest possible length of a side of the triangle?

Chemistry
60g/1.42g/ml= 42.25ml Molarity concentrated sol= .060/63*1/42.25= 2.25 so you want to dilute it 2.25/1 times, which means one part concentrated HNO#, 1.25 part water. One part is 2ml, so 1.25 part water is 2.50ml First, the pure acid is what molarity? 1.42 x 1000 x 0.70 x (1/...

math
A jar contains 20 marbles: 4 red, 6 white and 10 blue. If you remove 1 marble at a time, randomly, what is the minimum number that you must remove to be certain that you have at least 2 marble of each color? I guessed the answer was 18 and it was correct but I don't know ...

math
In the z transformation formula, z = (x – M)/s the x stands for __________. (Points : 1)

math
Of the books in a library, 1/3 came from Robbie's collection and 15 came from Marta's. Of the rest, 15 were Elena's 1/5 were Winfield's, and 5 were purchased from the bookstore. How many book are there in the library?

math
How many quarts of water must be added to 18 quarts of a 32% alcohol solution to dilute it to a solution that is only 12% alcohol.

math
Avery paid \$168 on a cell phone. What was the original price of the phone if he got it at a 30 percent discount?

math
Mrs. Richmond bought some apples and pears in the ratio 3:5. After she gave away 3/5 of the apples and 40 pears, the ratio of apples to pears became 2:5. An apple costs 30 cents. A pear costs 15 cents more than an apple. How much did Mrs. Richmond pay for the fruit?

math
The square of a certain whole number N is N squared. If 60 is a factor of N squared, its possible that __ is not a factor of N squared.

math
ya don't say. I got the answer 2D+40c. but the answer key said it was 2D+.4c

math
The charge for renting a rowboat on Loon Lake is D dollars per hour plus c cents for each minute into the next hour. How many dollars will Mr.Wilson pay if he used a boat from 3:40 P.M. to 6:20 P.M.

chemistry
1-Dinitrogen tetroxide (N2O4) dissociates according to the equation: N2O4 ⇌ 2NO2 An equilibrium reaction mixture at 25 ºC was found to have the partial pressure of N2O4 as 72 kPa whilst the partial pressure of nitrogen dioxide (NO2) was 29 kPa. Calculate Kp for the ...

math
A box contains 4 red cards, 6 blue cards, and 10 green cards. What is the smallest number of cards we must remove from the box to make sure that we have 2 cards of the same color?

math
The difference between one half of a number and one fifth of it is 561. Find the number.

math
2 triangles of the same shape are always A) similar B) equilateral C) congruent D) symmetrical E) equal

math
1/a is a fraction. 1 is the numerator and a is the denominator. you need to plug in for a but I don't know how to solve it

math
a= 1/a, then a squared=?

math
The lengths of the diameters of two concentric circles are 6 and 8. What is the distance between the circles?

math
The cost of mailing a package is c cents for the first b ounces and d cents for each additional ounce. find the cost, in cents, for mailing a package weighing f ounces if f is more than b

Algebra
2.5

math
If 25 times were moved from Box A to Box B, there would be an equal number of dimes in both boxes. If 100 dimes were moved from Box B to Box A, the ratio of dimes in Box A to Box B would be 7:2. What was the original number of dimes in Box A?

Trigonometry
oN A LEVEL GROUND, A 5FT. PERSON AND A FLAGPOLE CAST SHADOWS OF 10 FEET AND 60 FEET RESPECTIVELY. WHAT IS THE HEIGHT OF THE FLAGPOLE?

Trigonometry
On a level ground, a 5 ft. person and a flagpole cast shadows of 10 feet and 60 feet respectively. What is the height og the flagpole?

chemistry
4. Calculate the Gibbs’ free energy change for the reaction Mg(s) + H2O(g) → MgO(s) + H2(g) carried out at 100ºC given the data below. Under these conditions is this reaction product favoured? ΔHºformation (kJ mol^-1) MgO(g) -602 H2O(g) -242 H2(g) 0 ...

chemistry
3. Calculate the standard entropy change for the reaction: N2 + 3H2 → 2NH3 given the standard entropies Sº(N2)(g) = 191.6 J K^-1 mol^-1 Sº(H2)(g) = 130.6 J K^-1 mol^-1 Sº(NH3)(g) = 193.3 J K^-1 mol^-1

chemistry
2. Calculate the enthalpy change of combustion for ethene gas (C2H4) given the following enthalpy changes of formation: ΔHºf(C2H4)(g) = +52 kJ mol^-1 ΔHºf(CO2)(g) = -394 kJ mol^-1 ΔHºf(H2O)(g) = -286 kJ mol^-1

chemistry
1. Calculate the standard enthalpy change for the reaction: C2H4(g) + H2(g) → C2H6(g) given that the enthalpy of combustion for the reactants and products are: ΔHºc(C2H4)(g) = -1411 kJ mol^-1 ΔHºc(C2H6)(g) = -1560 kJ mol^-1 ΔHºc(H2)(g) = -...

math
Carrie can inspect a case of watches in 5 hours. James can inspect the same case of watches in 3 hours. After working alone for 1 hour, Carries stops for lunch. After taking a 40 minute lunch break, Carrie and James work together to inspect the remaining watches. How long do ...

math
mr. lee had a bag of red beans and a bag of black beans. 20% of the total number of beans were black, and there were 180 ounces more red beans than black beans. he transferred some red beans to the bag containing black beans, so that, the bag now contained 30% of the total ...

math
A Number N Divides Each Of 17 And 30 With The Same Remainder In Each Case. What Is The Largest Value N Can Have?

math
All sides are congruent.

nau
4x+y=21 7x-4y=8 21*8=168 ------------- 8(4x+y)=21(7x-4y) Solve

math
A girl walks 3/4 of the way home in 18 minutes. At the same rate, she can walk the rest of the way home in A. 4 1/2 minutes B. 6 minutes C. 9 minutes D. 24 minutes

math
A girl walks 3/4 of the way home in 18 minutes. At the same rate, she can walk the rest of the way home?

math
In a certain class there are 12 boys and 18 girls. If the class average for an algebra exam is 90 and the boys' average score is 87, what is the girls' average score?

accounting
A partner withdrew Rs.2000 at the beginning of every month.the rate of interest on drawings is 10%per annum. What is the amt. of interest?

Soil Chemistry
how is carbon dioxide different than water in terms of the behavior of each compound in Earth's atmosphere?

Clincal
A 12-year-old boy presents with his farther to the ER due to open wounds to his arm, hand, and upper leg. The injury occurred when the boy fell on a barbed-wire fence at the farm while running in the field. Diagnosis: Multiple lacerations to the right forearm, right hand, and ...

Commerce
Would it be called statistic, if it is said that there are 2000 students in the school

Physics
An automobile moving at a constant velocity of 25m/s passes a gasoline station. Two seconds later, another automobile leaves the gasoline station and accelerates at a constant rate of 4.0m/s^2. how soon will the second automobile overtake the first?

physics
what is the resultant of two 65N identical one acting easterly and the northerly

english
What is Bronte's main purpose in describing Jane's meals and activities at Lowood? A)to show how all schools operate B) to show the discomforts she endures at Lowood C) to show the interesting aspects of Jane's life at Lowood D) to show how students interact with ...

chemistry
How many mol of Argon is required to exert a pressure of 1.00 MPa at 50 ºC in a vessel that has a volume of 14 litres? (R = 8.314 J K^-1 mol^-1)

chemistry
What is the volume of 14 mol of ideal gas if its pressure is 233 kPa and its temperature is 140 ºC? (1 mol of ideal gas at STP occupies 22.4 L).

chemistry
2.00 m^3 of nitrogen gas at 14 ºC and 100 kPa is compressed to occupy 0.50 m^3. and its temperature rises to 42 ºC. Calculate the new pressure of the gas

chemistry
calculate the mass of water contained in 4.021 m^3 of saturated air at 27 ºCgiven that the saturate d vapour pressure of water at 27 ºC is 3.53 kPa. (RMM of water is 18.02, R = 8.314 J K-1 mol^-1

Soil Chemistry
Understanding the strengths of carbon halogen bonds can help us to understand the behavior of CFCs and related molecules. Arrange the members of the set of carbon halogen bonds shown below in the order of bond strength. A) carbon dioxide B) methane C) ozone D) water A) c > ...

math
there are seven consecutive even numbers .if the largest no is x write an algebraic expression for the middle no . if the middle no is 48 find the value of smallest no

Soil Chemistry
Understanding the strengths of carbon halogen bonds can help us to understand the behavior of CFCs and related molecules. Arrange the members of the set of carbon halogen bonds shown below in the order of bond strength. A) carbon dioxide B) methane C) ozone D)water A) c > b...

Soil Chemistry
Gasoline producers add oxygenated chemical compounds to reduce the amount of carbon monoxide produced when the fuel is burned. Methyl t-butyl ether (MTBE) is one such oxygenate that is no longer used because of health and environmental concerns. what are the correct exponents ...

Soil Chemistry
thank you so much damnon....and thanks for the article...I have a way better understanding of it now...:)

Soil Chemistry
Global temperatures are increasing and this increase is probably due to increasing concentrations of greenhouse gases present in A) the troposphere which absorbs outgoing IR radiation B) the stratosphere which absorbs outgoing IR radiation C) the troposphere which absorbs ...

AP Macroeconomics
Assume that the mix of goods in a basket is kept constant for long periods. If the price of one good rises very rapidly over several years, what will happen to the relative importance of the other goods in the basket? Is this a problem? If the price of coffee increases, we get...

english
What is Bronte's main purpose in describing Jane's meals and activities at Lowood?

Soil Chemistry
I am only given P1V1T1 though...I am not given the other values..P2V2 and T2

Soil Chemistry
Using the gas laws, calculate the new volume of methane gas at STP, which has escaped from a landfill and been captured at an initial pressure of 1.50atm, an initial volume of 30.0L and an initial temperature of 40.0C.

Soil Chemistry
an initial pressure of 1.50atm, an initial volume of 30.0L and an initial temperature of 40.0C.

Soil Chemistry
Chlorine is widely used to treat municipal water supplies and swimming pools. If the volume of a sample of Cl2 gas is 8.73L at 755mmHg and 24.0C, how many grams of Cl2 gas are in this sample? This is one of those multi step problems that I get lost....I need to to know how to ...

Soil Chemistry
In saturated soils, oxygen is quickly depleted and microbes must utilize the next most favorable electron acceptor, in this case sulfate (SO42-). Under these conditions, Mn (and Fe) are oxidized to Mn2+ (and Fe2+). Select the correct oxidation and reduction pair for Mn. A. ...

economic
Management and ownership of business are separate A) Sole Proprietorship B) Corporation C) Partnership I said a

math
100-41= 59

Math
Integrate and simplify the following function: y= ∫(ln√x/x^2)+x 2^(3-5x^2))dx

Math
Show that the derivative of y= cosh-1 (2x-1) is: dy/dx = √1/(x2-x)

physics
A missile is fired from a launcher with an initial velocity of 250 m/s at a target located 500 m above the launcher and at a horizontal distance of 3000 m. Determine the following: i) The possible firing angles required to hit the target. ii) The maximum height reached for all...

chemistry
Draw “arrows in a box” diagrams to illustrate the ground-state electronic configuration of the following species: 12 6C , 32 2 16 S − 28 14 Si , 57 2 28 Ni + , 35.5 17Cl− , 40 2 20Ca + , 31 15P

chemistry
Sulphuric acid (H2SO4) solution reacts with magnesium metal (Mg) to magnesium sulphate and hydrogen according to: H2SO4 + Mg → MgSO4 + H2 How many litres of 5.00 M sulphuric acid would be required to dissolve 20.00 g of magnesium and how many mol of hydrogen would be ...

ALGERBRA
A STATE LOTTERY IS DESIGNED SO THAT A PLAYER CHOOSES FIVE NUMBERS FROM 1 TO 30 ON ONE LOTTERY TICKET. WHAT IS THE PROBABILITY THAT A PLAYER WITH ONE TICKET WILL WIN? WHAT IS THE PROBABILITY OF WINNING IF 100 DIFFERENT TICKETS ARE PURCHASED?

Statistics
The complement of P(B | A) is 1 - P(B | A). Is it also true that 1 - P(B | A) = P(B' | A), where B' means the complement of B?

Math
In a sample of 78 widgets, 2 were defective. How many defective widgets would you expect in a sample of 468 widgets?

science 1 question!!!
Thanks so much Danny! 4/4 100%

Physics (electricity and Magnetism)
A long straight and thin wire has a charge Q per unit length. It is also carrying a current I. A point charge is moving with a velocity v parallel to the conductor, at a distance d from it. Find the velocity v, supposing a correct direction for the current and the current ...

math
gail borrowed \$3600 from a bank to buy a washing machine she pays back the loan in 24 monthly instalments at a simple interest rate of 2% a)calculate the simple interest on the loan b)the total amount to be repaid c)if gail repays the loan in 24 equal instalments ,find the sum...

Physics
A projectile is launched at an angle of 34.0o above the horizontal. The projectile has a mass of 1.50 kg and is given an initial speed of 20.0 m/s. a) What is the initial kinetic energy of the projectile? b) By how much does the gravitational potential energy of the projectile...

MATH PLZ HELP
the guys right 25 is the answer i got 100%

Geometry
If m<AHM = 3x+5 and m<TMH = 7x-27, find m<AHM prntscr(dot)com/3n61w3 For figure required for problem.

chemistry
How much naoh and hno3 is needed to make nano3?

maths
If x and y are positive integers, and square root = y + 3, then y^2 = ?

physics
Gamma rays (ã-rays) are high-energy photons. In a certain nuclear reaction, a ã-ray of energy 0.510 MeV (million electronvolts) is produced. Compute the frequency of such a photon.

appliance repair
Which one of the following letters is used in formulas as the symbol for voltage? A. P B. W C. I D. E

Help me? Thanks~
22. The joints highlighted in the image below are ______________ joints. image of transparent body with the spine highlighted the answer is vertbrate

Algebra
Did you ever get it?

Making a vaccine for HIV is difficult because the virus has a rapid rate of (A)__________. This is because it is a(n) (B)________ - its genetic material is RNA instead of DNA.

English
The question was "What lesson or meaning do you think this story held for the British audience of the Victorian Era?" This is for the story The Mark of the Beast by Rudyard Kipling. I was thinking that the answer was that the lesson was that just because someone ...

Calculus
An inverted conical tank is 3m tall and 1m in diameter at its widest point. The water is being pumped out of a spout 2m above the top of the tank. Recall that the density of water is ρ = 1000kg/m^3 (a) Find the work needed to empty the tank if it is full. Include units. (...

biology
budding

Chemistry
could you set this up for the first one for me please then i can do the other two

Chemistry
Calculate ΔG∘ at 298 K for the following reactions. Ca(s)+CO2(g)+12O2(g)→CaCO3(s) 2KClO3(s)→2KCl(s)+3O2(g) CO(g)+H2O(g)→H2(g)+CO2(g)

Post a New Question