# Don

Popular questions and responses by Don-
## Physic

A 3.5 kg block is pushed along a horizontal floor by a force of magnitude 15 N at an angle è = 40° with the horizontal. The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (a) the frictional force on

*asked on September 28, 2011* -
## Math C30

Equations containing circular functions and unit circle... solve 2cosx sinx + sinx = 0

*asked on November 1, 2011* -
## Technology

To insert clip art into a document, what step should I take immediately after i find the clip art I want to insert? a. Use scroll bars to view more choices of clipart. b. Click on the clip art image. c. Click on the clip art button. d. Click insert tab at

*asked on September 12, 2016* -
## math

you download 12 new songs to your mp3 player. then you delete 5 old songs.. write each amount as an integer?

*asked on August 28, 2014* -
## easy math

What value of c makes x^2 + 6x + c a perfect square trinomial? 3 6 9 12

*asked on October 28, 2016* -
## Math

Start at 5. Create a pattern that adds 3 to each number. Stop when you have 5 numbers.

*asked on September 22, 2016* -
## Calculus 3

In the methane molecule, each carbon atom is surrounded by four hydrogen atoms, which form a tetrahedron, with the carbon atom at its center. The bond angle theta is the angle formed by the H-C-H combination. Find the tetrahedron angle theta. Take the C

*asked on June 11, 2020* -
## Algebra

Write an equation of the line satisfying the given conditions. Vertical line through (6, -6)

*asked on May 17, 2010* -
## Physics

Two banked curves have the same radius. Curve A is banked at an angle of 11°, and curve B is banked at an angle of 16°. A car can travel around curve A without relying on friction at a speed of 18.5 m/s. At what speed can this car travel around curve B

*asked on November 7, 2012* -
## physics 30

an object is thrown from 1.5m above the ground with a velocity of 15m/s and at an angle of 25deg with the ground. using vectors and motion equations, determine how long the object will remain in the air before returning to the ground. ARGHHHHHH help

*asked on May 13, 2012* -
## MATH C30

How to find the amplitude, period, phase shift, vertical shift, and the equation of the primary function of the function: y = -cot(1/3x - pi/6) how to find where the period begins and ends

*asked on November 6, 2011* -
## Probabilities

A queen on an English chessboard is able to attack in the same row, column and diagonal. The probability that 2 randomly placed queens on an 8 by 8 chessboard will be able to attack each other can be expressed as a/b , where a and b are positive, coprime

*asked on February 28, 2013* -
## mathURGENT!!!!!!!!!!

find all ordered pairs of positive integers (x,y) that satisfy the following equation: x^y=2^64. please answer and explain how you got it!!!!

*asked on February 14, 2013* -
## chem

2 NO(g) + O2(g) 2 NO2(g) For the reaction above tell whether the reaction would shift to the left (L) or right ® if I a. Increased the total pressure of the system b. Removed O2 from the system c. Increased the amount of NO in the system

*asked on November 22, 2012* -
## Physics

A student (m = 63 kg) falls freely from rest and strikes the ground. During the collision with the ground, he comes to rest in a time of 0.0120 s. The average force exerted on him by the ground is +17000. N, where the upward direction is taken to be the

*asked on November 12, 2012* -
## math

how to write 9.035 in expanded notation

*asked on June 17, 2012* -
## Discete Math

Show that there must be at least 90 ways to choose six integers from 1 to 15 so that all choices have the same sum.

*asked on February 27, 2012* -
## Trig

Prove that the equation is an identity: cot4theta - csc4theta = -cot sq theta - csc sq theta How ??

*asked on December 17, 2011* -
## Business

If one company(A) owns another company(B) and Company B owns a third company (C) is it safe to say that Company A owns part of Company C? A real life example is the sports media group TSN is 20% owned by ESPN. ESPN is then in turn 80% owned by The Walt

*asked on March 14, 2011* -
## Chemistry

Instant cold packs used to treat athletic injuries contain solid NH4NO3 and a pouch of water. When the pack is squeezed, the pouch breaks and the solid dissolves, lowering the temperature because of the following endothermic reaction. NH4NO3(s) + H2O(l) =

*asked on February 1, 2011* -
## Chemistry (electron config)

Write electron configurations for the following ions. Tl^+ [Xe]4f^145d^8 is that correct?

*asked on October 26, 2010* -
## Chemistry

Write balanced equations for the following reactions. Express your answer as a chemical equation. Identify all of the phases in your answer. 1. chromium (III) oxide with dilute hydrochloric acid A: Cr2O3 (s) + 6HCl (aq) ---> 2CrCl3 (s) + 3H20(l) (my phases

*asked on October 26, 2010* -
## Algebra

Use the discriminant to determine how many real number solutions the equation has. t^2 + 8t + 16 = 0

*asked on May 23, 2010* -
## Algebra

A certain kind of animal weighs about 71 pounds at birth and gains about 2 pounds per day for the first few weeks. Determine those days for which the animal's weighs more than 117 pounds. The animal's weight is more than 117 pounds when the animal is more

*asked on October 2, 2009* -
## Math

What is the rule for adding or subtracting fractions?

*asked on September 18, 2008* -
## Algebra

A roof truss is in the shape of a triangle with height of x feet and a base of 2x + 1 feet. Write a polynomial A (x) that represents the area of the triangle. Find A (5).

*asked on July 14, 2008* -
## rounding numbers

I need to to round 423,607,492 to the ten thousands. I then need to round it to the million. Can someone help me. I will be happy to check your work. Which numeral is in the ten-thousand place in this number? Which numeral is in the million place? Once you

*asked on April 18, 2007* -
## probability

the probability of winning a carnival game is 15%. Elaine plays 10 times. find the probability that Elaine will win 2 times.

*asked on February 21, 2017* -
## Math (Help Please)

1. Which of the following shows how this expression can be simplified? 2x + 6 + 3x − 4 A. x − 2 B. x + 2 C. 5x + 2 D. 5x − 2 2. Which is equivalent to the expression below? 7(2p − 1) A. 7p B. 14p − 1 C. 14p − 7 D. 14p − 8 3. Factor the

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

A car covers half a distance at a velocity of 80km/h and the other half at 60km/h,what is the average velocity of the car?

*asked on March 9, 2015* -
## English **One Question**

In a sense we have come to our nation's capital to cash a check. When the architects of our republic wrote the magnificent words of the Constitution and the Declaration of Independence, they were signing a promissory note to which every American was to

*asked on February 3, 2015* -
## Math

The college president asks the statistics teacher to estimate the average age of the students at their college. How large a sample is necessary? The statistics teacher decides the estimate should be accurate within half year and be 92% confident. From a

*asked on September 21, 2014* -
## Math

Simplify the following expressions by using trigonometric form and De Moivre's theorem a. (√3-i)^4 b. (-4+4i√3)^5 c.(2+3i)^4 d. (4-i)^6

*asked on August 2, 2014* -
## MATHS STATISTICS

B. A soft-drink vending machine is supposed to pour 8 ounces of the drink into a paper cup. However, the actual amount poured into a cup varies. The amount poured into a cup follows a normal distribution with a mean that can be set to any desired amount by

*asked on May 13, 2013* -
## math

A telephone pole is 55 feet tall. Jeri stands in the shadow of the pole. She is 66 inches tall, gut her shadow is 12 feet long. How far away from the telephone pole is she standing.

*asked on March 6, 2013* -
## calculus

I need help with this problem: The path traveled by a golf ball with a 9-iron can be modeled with the quadratic equation, y= -0.042xsquared + 5x, where x is the distance in yards from the point it was hit and y is the height of the golf ball in feet.

*asked on February 19, 2013* -
## Physics

Two tiny conducting spheres are identical and carry charges of -19.8 µC and +54.5 µC. They are separated by a distance of 2.45 cm. (a) What is the magnitude of the force that each sphere experiences, and is the force attractive or repulsive? 1 N 2

*asked on January 29, 2013* -
## chem 1

if 58.44 g of sodium chloride is dissolved in 0.5 liter of water what is the molarity of the sodium chloride solution? The molar mass of sodium chloride is 58.44 grams per mole.

*asked on November 22, 2012* -
## Physics

During a storm, a tree limb breaks off and comes to rest across a barbed wire fence at a point that is not in the middle between two fence posts. The limb exerts a downward force of 148 N on the wire. The left section of the wire makes an angle of 12°

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

if AB=CD, AB is 12-y, CD = 3x-4y, BD = 18, AC = x+y, what is x, y, and AC

*asked on September 15, 2012* -
## math

6 builders worked 8 hours a day for 10 days to complete a job.If 8 builders worked 6 hours a day for 3 days,the remaining work has to be completed by 6 builders in 8 days.How many hours does each builder need to work each day?

*asked on August 11, 2012* -
## math

the day is 1hour 18minutes longer than the night.how long is the day?

*asked on July 5, 2012* -
## Physics

An electric drill operates at a potential difference of 120V and draws a current of 1.5 Amps. If it takes 50 seconds to drill a hole in a piece of steel,calculate the amount of electrical energy used by the drill in that time.

*asked on May 18, 2012* -
## Physics 30

a 2000kg car traveling east at 24m/sec enters an icy (frictionless) intersection and collides with a 3600kg truck traveling south at 10 m/sec. If they become coupled together in the collision, what is their velocity immediately after impact?

*asked on May 1, 2012* -
## algebra

if the red river is 500 miles longer than the blue river. if the sum of their lengths is 5550 miles what is the length of each river

*asked on April 16, 2012* -
## Math

Fred runs a lap every 2 minutes and Mark runs a lap every 2.5 minutes. They start together. How long will it be before they are next to each other again?

*asked on January 19, 2012* -
## Trig

Rewrite tan 88 deg in terms of its cofunction How does that end up????

*asked on December 22, 2011* -
## Programming

2. Then it should prompt the user for the input file name of the file containing the data to sort. 3. If the program can't open the file or if no file name is entered (^d or ^z is entered for EOF), it should print an error message and exit. 4. The file

*asked on June 29, 2011* -
## Chem

a container of 2.00 moles of an ideal gas as 1000 K undergoes a constant pressure and volume process in which the number of moles is increased to 5moles. what is the final temperature of the gas. How do I start this? Do I somehow use the ideal gas law?

*asked on November 30, 2010* -
## Calculus

Use Newton's Method with the function f(x)=x^2-2 and initial value Xo=2 to calculate x1,x2,x3. I have no idea how to do this

*asked on October 27, 2010* -
## Chemistry

Arrange the following atoms in order of increasing effective nuclear charge experienced by the electrons in the n = 3 electron shell: K,Mg,P,Rh,and Ti. I think that the effective nuclear charge increases as you go up a group and across a period. so Rh, K,

*asked on October 26, 2010* -
## Chemistry

Arrange the following atoms in order of increasing effective nuclear charge experienced by the electrons in the n = 3 electron shell: K,Mg,P,Rh,and Ti. I think that the effective nuclear charge increases as you go up a group and across a period. so Rh, K,

*asked on October 26, 2010* -
## Math

Anyone know about how much a button weighs in mg?

*asked on May 24, 2010* -
## Geometry

If the surface area of a sphere decreases, will the value of the volume remain the same?

*asked on May 24, 2010* -
## Physics

your friend says that the equivalent (combined) resistance of resistors connected in series is always more than the resistance of the largest resistor. Dou you agree?

*asked on April 11, 2010* -
## physics

A spaceship is observed traveling in the positive x direction with a speed of 150m/s when it begins accelerating at a constant rate. The spaceship is observed 25s later traveling with an instantaneous velocity of 1500m/s at an angle of 55 degrees above the

*asked on July 27, 2008* -
## history

How does the supreme court show that the constitution allows congress to exercise the power to regulate commerce within a state?

*asked on February 24, 2008* -
## math

I need help with write the equation of the line which contains the point (0,negavtive 3), or written ars(0, -3) and whose slope is 4. if you want the equation in the form y = mx + b sub in -3 for y, 4 for m, and 0 for x for -3 = 4(0) + b so b = -3

*asked on April 27, 2007* -
## Maths

PLEASE HELP ME!! The diagram shows the position of three airports . A,E and G. G is 200 kilometers from A, E is 160 kilometers from A, From G the bearing of A is 052 degrees, From A the bearing of E is 216 degrees. How far apart are airports G and E?

*asked on April 26, 2020* -
## algebra

74=6-h=qx=5=6.09009(0)=_______

*asked on December 7, 2018* -
## physics

A box is pushed a distance of 2 m with a force of 20 N. How much work is done on the box?

*asked on June 24, 2018* -
## Calculus

Let f(x)= (x^2 -4)/(x-2) and note that lim as x approaches 2 , f(x)=4. For each value of E, use a graphing utility to find all values whenever 00, make a conjecture about the value of delta S that satisfies the preceding inequality. How would you do this

*asked on May 28, 2018* -
## CHEMISTRY

A(aq) + B(aq) + C(aq) → D(aq) [A]. [B]. Rate (mol) 0.01 0.02 0.0005 0.02 0.02 0.0010 0.01 0.04 0.0020 Determine : a) The order of the reaction of each reactant b) The rate law c) The rate constant K, Using result from experiment 1. Please working answers

*asked on March 31, 2018* -
## Earth science

If a sample contains 50g of carbon 14 and 50g of nitrogen 14 , how many lives has it undergone ?

*asked on March 23, 2018* -
## Earth science

If a sample contains 50g of carbon 14 and 50g of nitrogen 14 , how many lives has it undergone ?

*asked on March 22, 2018* -
## Physics

Jason while driving on Kukum highway at 70 m.s – 1 seeing the traffic light turn red, he applies the brake and comes to rest in a time of 2 seconds. What is his deceleration?

*asked on March 7, 2018* -
## Math

How do you write ln(n) in log form? I know that you can convert log of some base by doing ln of the variable over ln of the base, but I don't know how to do the opposite.

*asked on December 5, 2017* -
## math

Anna has $15 more than Lala does. If I gave Lala $60, she will have three times as much as Anna. Find how much Lala has at the first place?

*asked on May 3, 2017* -
## math

5 apples costs 7 kg. Let x be the cost of 7 apples, make an equation to find out the cost of 7 apples

*asked on February 17, 2017* -
## Algebra

Six times a number less ten is equal to two times the same number plus four.

*asked on January 24, 2017* -
## Finance

Ron starts with a $100,000 mortgage at 8% for 30 years, annual payments. Ten year into the mortgage Ron is able to refinance the balance of the mortgage at 6%. a) If he chooses to refinance for 20 years what would his new payments be?

*asked on December 1, 2016* -
## Finance

Ron starts with a $100,000 mortgage at 8% for 30 years, annual payments. Ten year into the mortgage Ron is able to refinance the balance of the mortgage at 6%. a) If he chooses to refinance for 20 years what would his new payments be?

*asked on December 1, 2016* -
## Maths

Four numbers 2, -3, 5 and -7 are arranged in a pattern as shown. 2, -3, 5, -7, 2, -3, 5, -7, 2, -3 .......... what is the 2005 number?

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

Bakery salary $24,000 Kitchen salary $26,000 Catering salary $30,000 Bar salary $30,000 Server/host $25,000 What department has the largest difference between the highest and lowest employee

*asked on October 7, 2016* -
## Math

Number of employees in Kitchen is 2 Salary is $52,000 Avg. cost of employee 26 If the avg. cost per salaried employee increase by $4,000 in the kitchen department, what is the new average cost per employee in the department

*asked on October 7, 2016* -
## Language

What word means the opposite of offensive Affable Zealous Acclivitous Intimate Synergetic

*asked on October 7, 2016* -
## Math

100(1+100) Example : 1+2+3+…+100= ----------- 2 Simplify: (x+1) + 2(x+1)+ …+1000(x+1)

*asked on August 20, 2016* -
## English

It is not from the benevolence of the butcher the rewer, or the baker, that we expect our dinner, but from their regard to their own interest.

*asked on March 17, 2016* -
## math

If you place $2,000.00 in a saving account with an interest rate of 4.5% month versus an account with a rate of 3.75% month, how much more interest could you earn in that month using the first account?

*asked on March 14, 2016* -
## FIN 301

1. Cliff Arthur has equally attractive job offers in Miami and Los Angeles. The rent ratios in the cities are 8 and 20, respectively. Cliff would really like to buy rather than rent a home after he moves. Explain how to interpret the rent ration and what

*asked on June 20, 2015* -
## Physics

a 475 kg pre-stressed concrete beam is to be raised 10.0 m in 24.0 s. how many kw of power is needed to for the job

*asked on April 2, 2015* -
## physics

Show that the kinetic energy of two particles with mass m1 and m2 split into the energy of the centre of mass and the kinetic energy of relative motion.

*asked on March 9, 2015* -
## English LAST 1. (:

It's about MLk I Have A Dream speech. Why does King use the rhetorical technique of parallel structure in his speech? A)to show that he is aware of the time that has passed B)to show that others are not aware of the time that has passed C)to show that two

*asked on February 3, 2015* -
## Market Research

Let N 6 and n 3. For purpose of studying sampling distributions, assume that all population values are known. Specically, y1 98, y2 102, y3 154, y4 133, y5 190, and y6 175. We are interested in yU, the population mean. Two sampling plan

*asked on November 3, 2014* -
## algebra

A three quarter inch wire has 12 ohms resistance. How much resistance has the same length of half-inch wire, if resistance varies inversely as the square of the diameter?

*asked on May 23, 2014* -
## English

What is a metaphor for a deep voice?

*asked on May 22, 2014* -
## Math homework help

Check out the polar coordinate pairs that label the same point. Several pairs may be possible. A) (2, 2pi/3) B) (2, -pi/3) C) (-3, pi) D) (2, 7pi/3) E) (3,0) F) (-3,0) G) (-2, -pi/3) H) -3, 2pi)

*asked on May 17, 2014* -
## Algebra 1

2+11b=8b+15

*asked on November 4, 2013* -
## DISCRETE MATHS

Prove that if n is an odd positive integer, then 1 ≡ n2 (mod 4).

*asked on October 25, 2013* -
## DISCRETE MATHS

Use the Euclidean Algorithm to find gcd(112,15)

*asked on October 4, 2013* -
## DISCRETE MATHS

What is the cardinality of this set? {p, {p}, {p, {p}}} my answer is 1. is it right?

*asked on September 2, 2013* -
## pre-calculus

Move point (3,50 degrees) according to the following symmetries (keep positive) a. symmetrical to the origin b. symmetrical to theta=0 degrees c. symmetrical to theta= 90 degrees

*asked on June 2, 2013* -
## stats please help ASAP!!!

A. The GPAs of all 5540 students enrolled at a University have an approximately normal distribution with a mean of 3.02 and a standard deviation of 0.29. Let x be the mean GPA of a random sample of 48 students selected from this University. Find the mean

*asked on May 17, 2013* -
## MATHS STATISTICS

A. According to an estimate, 50% of the people in the United States have atleast one credit card. If a random sample of 30 persons is selected, what is the probability that 19 of them has atleast one credit card? PLIZ REALLY NEED HELP!! THANKS VERY MUCH..

*asked on May 13, 2013* -
## linear algebra

solve using gauss jordan 10y − 4z + w = 1 x + 4y − z + w = 2 3x + 2y + z + 2w = 5 −2x − 8y + 2z − 2w = −4 x − 6y + 3z = 1

*asked on May 13, 2013* -
## Math

The local dinner offers a meal combination consisting of an appetizer, two soups, four main courses, and five desserts. Your diet retricts you to choosing between a dessert and an appetizer. (You cannot have both). Given this restriction, how many

*asked on May 6, 2013* -
## mathURGENT!!!!!!!!!!

if 4^(x)-4^(x-1)=24 what is the value of (2x)^x? please answer and explain step by step how u got it... PLEASE?????

*asked on April 20, 2013* -
## mathURGENT!!!!!!!

if (4^x)-(4^x-1)=24 what is the value of (2x)^x? please answer and explain step by step how u got it... PLEASE?????

*asked on April 20, 2013* -
## Physics

A loop of wire has the shape shown in the drawing. The top part of the wire is bent into a semicircle of radius r = 0.12 m. The normal to the plane of the loop is parallel to a constant magnetic field ( = 0°) of magnitude 0.85 T. What is the change ÄÖ

*asked on April 8, 2013* -
## Physics

In 1996, NASA performed an experiment called the Tethered Satellite experiment. In this experiment a 2.20 104-m length of wire was let out by the space shuttle Atlantis to generate a motional emf. The shuttle had an orbital speed of 7.50 103 m/s, and the

*asked on April 8, 2013*