# Dan

Newest questions and responses by Dan-
## math

A box contains 8 red marbles, 8 green marbles, and 10 black marbles. A sample of 12 marbles is to be picked from the box. How many samples contain exactly 7 red marbles or exactly 6 green marbles? The answer key sets it up as (8 nCr 7)*(18 nCr 5)+(8 nCr

*asked on October 17, 2018* -
## engineering science

Given the circuit below with unknown voltage source and a voltage drop of 2.233 v Volts on resistor R3, with (R1 = 2KΩ, R2 = 1KΩ, R3 = 3.3KΩ, R4 = 4.7KΩ, R5 = 4.7KΩ). Calculate and complete the table below.

*asked on October 15, 2018* -
## linear algebra

Let S be the plane defined by 2x+4y+2z = 4, and let T be the plane defined by x+3y+3z = 2. Find the vector equation for the line where S and T intersect.

*asked on September 30, 2018* -
## linear algebra

Let L1 be the line passing through the points Q1=(3, −3, 4) and Q2=(−3, 6, 7). Find a value of k so the line L2 passing through the point P1 = P1(−6, 11, k) with direction vector →d=[1, −1, −2]T intersects with L1. Not sure how to go on..

*asked on September 26, 2018* -
## Algebra

Let L1 be the line passing through the points Q1=(−2, −3, −4) and Q2=(−5, −2, −3) and let L2 be the line passing through the point P1=(−27, 31, −25) with direction vector →d=[−6, 9, −6]T. Determine whether L1 and L2 intersect. If so,

*asked on September 26, 2018* -
## Algebra

The parametric equations for a line L1 are as follows: x = −1−2t y = 4+4t z = 3−2t Let L2 be the line parallel to L1 and passing through the point (2, 5, −3). Find the point P on L2 whose x-coordinate is −3. P = (−3, 0, 0)

*asked on September 25, 2018* -
## physics

Starting from a trail 1.0m above the water level, you climb straight up a cliff to a point 15m above the water. You then shallow dive into the water and climb back to the trail. Find your displacement (Δx) as well as the distance (d) you covered (not

*asked on September 23, 2018* -
## physics

The space shuttle had a takeoff acceleration approximately 3.5 times the acceleration due to gravity. What was the speed of the space shuttle 120.s after takeoff if it maintained that acceleration?

*asked on September 23, 2018* -
## Analytical Geometry

Find the equation of the circle that passes through the point of intersection of the circles x^2+y^2=2x, x^2+y^2=2y and contains the point (2,1)

*asked on June 25, 2018* -
## Social Studies

7. Which of the following is a way that Native Americans in Washington have become more economically self-sufficient? 1.canoe journeys from Vancouver Island **** 2.relocation of reservations near urban centers 3.fishing and gaming operations, such as

*asked on June 7, 2018* -
## math

Find the indicated nth partial sum of the arithmetic sequence. 2, 10, 18, 26, . . ., n = 15

*asked on May 14, 2018* -
## math

Find the partial sum. 100 Σ 2n n = 1

*asked on May 14, 2018* -
## math

A hardware store makes a profit of $41,000 during its first year. The store owner sets a goal of increasing profits by $9000 each year for 4 years. Assuming that this goal is met, find the total profit during the first 5 years of business.

*asked on May 14, 2018* -
## Science

"In this lesson, you learned about renewable energy resources and nonrenewable energy resources. Think about the resources discussed in this lesson and select the one that you think is the most effective in all ways. Think about the financial impact, the

*asked on May 3, 2018* -
## Math

Solve the system of equations algebraically. Show all of your steps. y=x^2+2x y=3x+20

*asked on May 2, 2018* -
## Algebra

16 1/4 simplify expression assume all variables represent positive numbers

*asked on December 5, 2017* -
## PHYSICS HELP

(a) If your relaxed eye has a refractive power of 56.0 D, and your lens-to-retina distance is 2.35 cm, determine if you are nearsighted or farsighted. (b) If you are nearsighted, determine your far point. If you are farsighted, determine your near point.

*asked on December 4, 2017* -
## electrical year 2

how do i answer this. A series RL circuit contains two resistors and two inductors.the resistors are 33 ohms and 47 ohms the inductors have inductive reactances of 60 ohms and 30 ohms. the applied voltage is 120 v. what is the voltage drop on the 33 ohm

*asked on October 23, 2017* -
## History

Which religion was prominent to much of North Africa in the early 1800s?

*asked on October 12, 2017* -
## Physics

A golfer hits a shot to an elevated green. The ball leaves the club with an initial speed of 16 m/s at an angle of 58' above the horizontal. If the speed of the ball just before it lands is 12 m/s, what is the elevation of the green above the point where

*asked on October 10, 2017* -
## math

jeff jogged 5/6km while jon joghed 7/12km whi jogged longer?by how manu kilometer?

*asked on September 27, 2017* -
## math

jeff jogged 5/6km while jon jogged 7/12km.who jogged longer bu how many kilometers?

*asked on September 27, 2017* -
## math

jeff jogged 5/6km while jom jogged 7/12km.who jogged longer? by how many kilomteres?

*asked on September 27, 2017* -
## Mathemetics

the value of a machine depreciates each year by 15%of its value at the beginning of that year. if its value when new on 1st JANUARY 1980 was 10,250, what was its value in January 1989 when it 9years old?

*asked on August 24, 2017* -
## Science

I have two questions and I have answers for them and I don't know if there right or not. The ones that have stars by the answers is the answers I picked. 1. Complete this sentence. If volume remains the same while the mass of a substance ________, the

*asked on August 22, 2017* -
## Anatomy & Phisiology

Given: WBC count is 10,000 per cubic millimeter of blood; Blood volume is 5 liters; 60% of WBC are neutrophils; Their average lifespan is 12 hours. Question: How many neutrophils need to be produced every hour on average to keep the count a constant?

*asked on May 1, 2017* -
## physics

A railroad car with a mass of 1.98 ✕ 104 kg moving at 2.92 m/s joins with two railroad cars already joined together, each with the same mass as the single car and initially moving in the same direction at 1.54 m/s. (a) What is the speed of the three

*asked on April 26, 2017* -
## physic

1. A 57 g tennis ball is moving to the left at 36.2 m/s. It collides with a wall and rebounds to the right. The tennis ball is in contact with the wall for 0.107 s and it loses 14% of its kinetic energy during the impact. What is the average force

*asked on April 21, 2017* -
## Geography (solar declination)

For a assignment we were told to go outside at 12:30 and stand w/ our backs to the sun and measure our shadow. Then for the second part we were asked what would the difference be if we did the same thing on June 21st? (summer solstice). If it were done on

*asked on April 6, 2017* -
## Geography (w/ geometry)

I am completely confused when it comes to this problem, I don't even know where to start. I tried just seeing how many times the bridge length goes into the building's shadow but still comes up way short. this is the problem (btw in the real life photo the

*asked on April 5, 2017* -
## Geography (w/ geometry)

So I'm trying to calculate the latitude of where I am via a few factors. My lesson says I need to know the following: The date of my measurements: 4/3/17 the time: 12:30 my height: 5' 10" my shadows length: 4' 6" It then says first, compute the angle of

*asked on April 4, 2017* -
## Calculus

Find dy/dt where y = 2 sqrt(2)− 4 and dx/dt = 9 when x = 4. I found the derivative of y=2sqrt(2)-4 but I am stuck as to where to plug in dx/dt

*asked on March 21, 2017* -
## physics

The spring is compressed against the floor a distance of 1.6 cm and released. If the spring constant is 60 N/m, what is the magnitude of the spring force acting on the toy at the moment it is released?physics

*asked on March 14, 2017* -
## physics

In an arcade game, a 0.12 kg disk is shot across a frictionless horizontal surface by being compressed against a spring and then released. If the spring has a spring constant of 230 N/m and is compressed from its equilibrium position by 8.0 cm, what is the

*asked on March 13, 2017* -
## Chemistry

Convert the information described below into balanced equation: (a) When a mixture of copper(II) oxide and carbon is heated, elemental copper forms and carbon monoxide evolves into the atmosphere. (b) When a concentrated solution of sodium hydroxide is

*asked on March 12, 2017* -
## Algebra

a large pizza costs $6.80 plus $.90 per topping. a different pizza costs $7.30 plus $.65 per topping. How many toppings need to be added to each piece in order for the pizzas to cost the same thing?

*asked on March 10, 2017* -
## Social Studies 6th grade

What is a modern form of paper.

*asked on March 8, 2017* -
## Social Studies

How has paper changed over time.

*asked on March 8, 2017* -
## Language/english

In a paragraph, compare and contrast the two forms of poetry haikus and limericks. It should include a specific description of each form. Explain how they are both alike and how they are different.

*asked on March 2, 2017* -
## language

1:Which word is a conjunction in the sentence: The man quickly but carefully opened the oysters hard shell. A:quickly B:but C:carefully D:opened

*asked on March 2, 2017* -
## physics

a uniform plank of lenght 5m and a mass1kg support two masses of 500g and 300g . determine the centre of gravity

*asked on February 15, 2017* -
## Math

Graphic designer has offered client 3 options. Poster 1 16x20 inches. Poster 2 1/2 the side of option 1. Option 3 poster that is 5/4 the size of Option 1. The photo on Option 1 is 4x5inches what size would that photo be on Option 2 and Option 3?

*asked on February 15, 2017* -
## grammer

find the error?? The client’s hospital stay was prolonged, do to a superinfection. client’s/stay was/do to

*asked on February 10, 2017* -
## physics

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 11.2 m long. His speed at the bottom of the swing is 7.4 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ✕ 103 N. What is the largest mass that

*asked on February 7, 2017* -
## Math

The flower produced by the morning glory has a polygon appearance. Classify and name the polygon produced by the flower What does classify mean?

*asked on January 26, 2017* -
## science

A car slows down from a speed of 20m/s to rest in 25 seconds.Find its acceleration.

*asked on December 8, 2016* -
## physics

A pendulum clock has a pendulum shaft made of aluminum which has a coefficient of linear expansion of 24.0*10^-6K^-1. At 22 degrees celsius the period of the swing of the pendulum is 1.00seconds. If the temperature is reduced to 5 degrees celcius, how much

*asked on November 26, 2016* -
## Physics

The temperature of the Sun’s surface (the so-called photosphere) is about 5500 C. Assume that the Sun’s surface is pretty close to a perfect black-body emitter. (a) At what wavelength does the peak intensity of Sun’s radiation lie? (b) Estimate the

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

I am doing volume and surface areas of 3D figures, and am running into the problem of having to give the exact answers as well as approximate answers. The approximate answers I don't have a problem with but the exact answers are requiring me to get the

*asked on November 14, 2016* -
## Geometry

Samantha is buying carpet for her family room, which is 8 yards by 13 yards. The carpeting is sold in square meters. How many square meters of carpeting will she need? (Use 1 yd ≈ 0.9144m.) I am pretty sure 8 and 13 need to be squared and

*asked on November 11, 2016* -
## Math

Start with the integer 4. Subtract 8. From your answer subtract -2, and then subtract 17 from the last answer. What is your final answer?

*asked on November 9, 2016* -
## Stats

In each hand of Blackjack, Megan wins $2 with probability 0.1, or wins $1 with probability 0.3, or loses $1 with probability 0.6. Suppose Megan continues to play 100 hands of Blackjack, and assume the outcomes of all plays are independent. (a) Compute the

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

the dollar price for a barrel of oil sold at a certain oil refinery tends to follow the demand equation below where x is the number of barrels of oils on the hand in ( millions ) a) how much should be charged for a barrel of oil if there are 6 million

*asked on November 3, 2016* -
## Algebra

New Orleans has highest elevation of 25, lowest -8. Long Beach has highest 360, lowest -7. Which city has an average elevation of -2?

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

If recipe takes 1-1/4 cups of sugar to 2 cups of milk but if you only have 1 cup of sugar then how much milk do you use?

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

At a local music store CDs cost 11.99including tax is the number of CDs purchased proportional to the cost of the CDs

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

A car will skid to a halt at a uniform rate of -9.4 m/s^2. If you measure skid marks that are 34 m long, with what speed was the car going just before the driver slammed the brakes?

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

-7-14 :(-7)=

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

If 3/8 of a cup of milk makes 6 muffins , how many muffins does 1 cup of milk make

*asked on September 20, 2016* -
## hcc

When you add sugar to it, your cup of coffee becomes not only sweet, also fattening. which part is wrong??

*asked on September 11, 2016* -
## hcc

which part is wrong? When a person finds itself in stressful situation, it helps to breath deeply.

*asked on September 11, 2016* -
## hcc

The bottle of tablets has an expired expiration date. which part is wrong???

*asked on September 11, 2016* -
## hcc

The physician started to perform the operation but the patient was not yet completely under anesthesia. which part of sentence is wrong?

*asked on September 11, 2016* -
## hcc

A tuberin skin test should be read within 24 hours administered. since-from-as

*asked on September 9, 2016* -
## Math

5= 6y; y

*asked on July 25, 2016* -
## Math

X= 2; 7x^3 + 4

*asked on July 25, 2016* -
## accounting

A term investment of 85000, is madr for 10 years at 4.25% interest. Find the value of the investment at maturity if interest is compoundes quarterly?

*asked on June 16, 2016* -
## Frederick

A wire of length 50cm is cut into two parts and each part is bent to form a square. If the total area of the two square is 100cm², find the perimeter of each square.

*asked on June 15, 2016* -
## Chemistry

When 28.2706 grams of solute are used to make a 932 mL solution of potassium hydroxide, what is the concentration of the solution?

*asked on May 16, 2016* -
## Chemistry

How many grams of solute are required to make a 789 mL solution of calcium acetate with a concentration of 0.0049 M?

*asked on May 16, 2016* -
## Maths

There is a lampost of twenty meters in height casting light on a tree 10 metres. How long is the shadow of the tree?

*asked on May 13, 2016* -
## Physics

During a free kick at a soccer playoff game a 0.5 kg ball at the peak of the kick 14.7 m above the field had a kinetic energy of 34.0 J. How fast was the ball booted by the player on the field?

*asked on May 3, 2016* -
## Physics

A bead of mass m = 41.5 kg is released from point A which is located 5 m above the ground and slides on the frictionless track as shown in the figure. Determine the beads speed when it reaches point C which is located 2.0 m above the ground

*asked on May 3, 2016* -
## Physics

A 3.1 kg pendulum bob hangs from a 2 meter string. It is pulled to the side, position A, so that the bob is 98 cm (h on the sketch) above the lowest position, position C. The bob is released and begins to swing. What is its potential energy after it has

*asked on May 3, 2016* -
## Physics

A point mass m = 115 g hangs from a string of length l = 1.07 m. Calculate the value of v, the initial speed m should be given at the bottom, so that the string reaches a maximum angle of = 31.4°?

*asked on May 3, 2016* -
## Math

Which equation represents the relationship in the table below? K . M -----------.------------ 1 . 5 2 . 10 3 . 15 4 . 20 5 . 25 A) m=5k B) k=5m C) m= 5 + k D) k= 5 + m

*asked on April 25, 2016* -
## maths

solve the equation log(y)/log(2) + log(y)/log(4) = 6

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

I have to find out the direct object pronoun and then replace the direct object with a direct pronoun. Please check my answers. 1.My friend sells his new car. (car is the direct object, and I replace car with im not sure. 2. My parents watch the news . (

*asked on March 31, 2016* -
## English

I need an example of a simile for 'relieved'.

*asked on March 28, 2016* -
## Calculus

Let f(x) be defined by f(x) = x/(x - 4). What is the image of f?

*asked on March 28, 2016* -
## Calculus

The function f(x) = x^3 + x an inverse. Compute f^-1(0) and f^-1(2). Hint: Do not try to evaluate f^-1 explicitly.

*asked on March 28, 2016* -
## business math

Camille Keegan sells lamps for $105.55 that cost her $75.00. Camille's percent of markup based on the selling price is:

*asked on March 23, 2016* -
## Chemistry

Aqueous sodium sulfide reacts with aqueous calcium chloride to make a solid. The % yield is 85%. Calculate the amount of each reactant needed to actually make 3.0g of the solid.

*asked on March 20, 2016* -
## Chemistry

We did a titration of calcium hydroxide lab in chemistry, once with and once with edta, we have to calculate the solubility for both, and the ksp, for the hcl I did (concentration)*(Volume of hcl used) then that answer divided by two divided by the amount

*asked on March 14, 2016* -
## Physics

Someone please help. A radio needs to be tuned to a range of values between 526.5 - 1606.5 kHz. Choose a combination of inductor and variable capacitor values within a tuned circuit that would meet this requirement. Choose practical components from

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

Construct a 2 × 2 matrix that defines a shear of factor 4 in the y-direction, followed by a scaling of factor 5 in the x-direction, followed by a reflection about the y-axis.

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

Find a single matrix that defines a rotation of the plane through an angle of π/6 about the origin, while at the same time moves points to five times their original distance from the origin.

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

Where is somewhere I can get a definition from that I can cite as a scholarly source? My prof said that we can't use an online dictionary.I need to find the definition of universal health care if that matters

*asked on March 1, 2016* -
## Chemistry

I did a lab, an kinetics lab (iodide clock) and in my lab report I have to calculate the initial rate in mol L-1 s-1 and I'm not sure how to do that. I have the [I-] and [S2O82-] in mol L-1 already. The reagents are [KI] [NaCl] [Na2S2O3] [Na2SO4] [K2S2O8].

*asked on February 29, 2016* -
## U.S History

Are advertisements valuable primary sources/reflections of culture? Why or why not?

*asked on February 27, 2016* -
## Chemistry

27% of heat produced by the stove's gas burner is transferred to the soup in the covered pot, the rest is lost. Determine the total mass in grams of methane that must be burned to heat 800 ml of water from 22 to 90 degrees C. The density is 1.08 g/ml and

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

I have to write the rate law for two elementary reaction equations A ) 2a+b>c+d B ) X+Y>Z I'm pretty sure it's just k[ A ][ B ] and k[ X ][ Y ] but does the coefficient affect it in this case? is it [ A ]^2 ?

*asked on February 24, 2016* -
## Chemistry

PART 1 >>Trial 1 Reactant Solution A 10 ml I^-, 5.0 ml S2O3^2- Reactant Solution B 10 ml S2O8^2-, 1 ml starch time to react = 10 seconds >>Trial 2 Reactant Solution A 10 ml I^-, 5.0 ml S2O3^2- Reactant Solution B 5 ml S2O8^2-, 1 ml starch time to react =

*asked on February 24, 2016* -
## Chemistry

PART 1 >>Trial 1 Reactant Solution A 10 ml I^-, 5.0 ml S2O3^2- Reactant Solution B 10 ml S2O8^2-, 1 ml starch time to react = 10 seconds >>Trial 2 Reactant Solution A 10 ml I^-, 5.0 ml S2O3^2- Reactant Solution B 5 ml S2O8^2-, 1 ml starch time to react =

*asked on February 24, 2016* -
## Chemistry

I have to write the rate law for two elementary reaction equations A ) 2a+b>c+d B ) X+Y>Z I'm pretty sure it's just k[ A ][ B ] and k[ X ][ Y ] but does the coefficient affect it in this case? is it [ A ]^2 ?

*asked on February 24, 2016* -
## Math

I need to find the limit as x goes to 3 of (1-sqrt(x-2))/(x-3)), I know the answer is -1/2 but I have no idea how to get to the answer, and help would be appreciated

*asked on February 17, 2016* -
## Chemistry

I have to calculate the heat capacity of a coffee cup calorimeter, but I'm not sure how. I have NaCl and NaOH, they both start at the same temperature, and I have the mass of the solutions used. I'd appreciate the help!

*asked on February 8, 2016* -
## Science

Hydrogen peroxide can be prepared in several ways. One method is the reaction between hydrogen and oxygen, another method is the reaction between water and oxygen. Calculate the ΔG°rxn of each reaction below? 1) H2(g) + O2(g) H2O2(l) ΔG°rxn=? (in kJ)

*asked on February 5, 2016* -
## Math

find the limit as x->3 of (1-sqrt(x-2))/(x-3) I'm not sure how to get the answer, I know it's -1/2, but I don'y know how to get that.

*asked on February 5, 2016* -
## math

The graph of y=x^2 is transformed by a stretch of scale factor 2 parallel to the x axis, followed by a translation of (0 3). WRITE DOWN the equation of the new graph

*asked on February 3, 2016*