# Posts by john

Total # Posts: 8,426

**physics vectors**

Consider the two vectors A with arrow = 3 i − j and B with arrow = − i − 6 j. Calculate the directions of A with arrow + B with arrow and A with arrow − B with arrow. A with arrow + B with arrow ° (counterclockwise from the +x axis) A with arrow &#...

**physics**

A plane flies from base camp to Lake A, 260 km away in the direction 20.0° north of east. After dropping off supplies it flies to Lake B, which is 150 km at 30.0° west of north from Lake A. Graphically determine the distance and direction from Lake B to the base camp. ...

**physics vectors**

i don't understand the direction

**science**

While exploring a cave, a spelunker starts at the entrance and moves the following distances. She goes 75.0 m north, 250 m east, 109 m at an angle θ = 30.0° north of east, and 156 m south. Find the resultant displacement from the cave entrance. The figure below ...

**Math**

Change the next 3 numbers

**Math**

How do you compare whole numbers through the millions?

**Social Studies PLEASE HELP!**

How does the US regulate the gathering/use of wood? I am working on a school project, I am supposed to research, I looked everywhere in my textbook and online and couldn't find anything. Can anyone help me?

**Social Studies**

Freds answers are correct

**Algebra**

Not sure why I thought I wasn't able to divide 32.4k by 9.9 Anyways, thank you for the help, my answer came out to 3.98 (rounded up)

**Algebra**

Need some help with this question 65.9 - 32.4k/9.9 = 13.3k / stands for a fraction bar

**Math**

This is a long division problem Divide 24 into 576020 When you get to a number less than 24 that is the amount that will be donated.

**Math**

I think you meant all 3 pillows. 4 inches times 4 sides = 16 inches then 16 inches time 3 pillow = 48 inches

**Math**

-1/2 + 2 = 1 1/2

**physics**

calculate the escape velocity of a satellite from the earth's gravitational field,if the radius of the earth is 6.4×10^6m

**math**

14

**Science**

I like 1.

**Math**

.72 would be 72/100 if repeating 72/99 always create the non repeating and subtract 1 from the denom. now reduce 72/99 to 8/11

**Math**

A = K cube root 8 divided by 2/3 A = K 2 times 3/2 A =2k K stands for a constant. I don't know if your teacher wants A= 2 or 2K for the answer.

**math**

1/3(10t + u ) = t + u + 1 3t = u 1/3 (10t + 3t) =t + 3t +1 1/3 13t = 4t + 1 13t = 12t + 3 t = 3 u = 9 check: 1/3(39) = 3 + 9 + 1 yes 13 = 13

**Math**

nicely

**probability**

John hs 3 red markers and 5 blue markers. What is the probability that he picks a red marker, and then, without replacing it, selects another red marker? Please show me how to set this up (you don't have to give me the answer)...thank you

**math**

I agree

**physics**

A cm^3 is a block that is a cm x cm x cm. If you have a piece of gold that is that size. 1 cm x 1cm x 1cm then it will have a mass of 19.6 grams. Just another note a cubic cm is also equal to a milliliter.

**Chemistry**

If 0.896g of a gas occupies a 250mL flask at 20 degree celcius and 760 mmHg of pressure, what is the molar mass of the gas?

**Math**

5 units to the left because you are going from a -2 to a 3 which is a difference of 5.

**Statistics**

Question was 15 years or more.. so the answer is 41.9% or 42%

**Math**

The average age of Ali,Ben and Chandra is 10 years.Ali is 3 years older than Ben.Ben is 6 years older than Chandra.how old is Chandra

**math**

Xy

**Physics or Math**

Question: A Toyota car travelled at the rate of 70 km/hour leaves the house 2 hours after a Kia car has left and overtakes it in 5 hours. at what rate was Kia car travelling? what's the formula pls?

**Physics**

Question: A Toyota car travelled at the rate of 70 km/hour leaves the house 2 hours after a Kia car has left and overtakes it in 5 hours. at what rate was Kia car travelling? What's the formula?

**Physics**

Question: A Toyota car travelled at the rate of 70 km/hour leaves the house 2 hours after a Kia car has left and overtakes it in 5 hours. at what rate was Kia car travelling? What's the Formula pls? Thanks

**Physics**

Question: A Toyota car travelled at the rate of 70 km/hour leaves the house 2 hours after a Kia car has left and overtakes it in 5 hours. at what rate was Kia car travelling?

**College Chem.**

A scientist adds 1.00 moles of phosphoric acid to a liter of water to make a solution. How many moles of NaOH should be added to ensure that the concentration of H2PO4- is equal to three times the concentration of HPO42? Remember that H3PO4 is a triprotic acid. I don't ...

**statistics**

Break even is when R(x) =C(x) 200x - x^2 =70x +2200 0 = x^2 -130x +2200 Factor (x-110)(x-20) = 0 x = 110 or x =20 Given the values of x stated above. Your only possible answer is 20.

**mathematics**

There are 7 days in a week. 1/7 chance that today is Tuesday. If today is Tuesday then we have a probability of 1 that tomorrow is Wednesday. 1/7 times 1 = 1/7

**math**

n = 1st n+1 = 2nd n+2 = 3rd n+n+1+n+2 = 18 3n + 3 = 18 Can you find n? Once you substitute the number for n to find the three numbers listed above. Then add them up to be sure that they do add to 18.

**Algebra**

sugar 3 1/4 cups = 13/4 cups Multiply 13/4 times 3/8 (13 x 3)/(4 x 8) leave in simplest form. Most likely you should convert back to a mixed number. flour triple batch means to multiply by 3 2 3/5 cups = 13/5 multiply by 3/1 39/5 = changed back to a mixed number.

**Math**

x^-1/4 = 4^-1/2, what is the value of q?^ raise both sides to the - 4th power multiply - 1/4 times -4 = 1 multiply -1/2 times -4 = 2 x = 4^2 x = 16 Now you can find q.

**Sociology**

Conflict theory :) Now, all I have to do is explain how it is that way.

**Sociology**

Would the factory workers be under the conflict or functionalism theory?

**Sociology**

I'm doing a discussion board on Apple iPhones and how harsh the work conditions are for their employees. I'm trying to tie that all together into my sociology class.

**Math**

The shorter edges of a 36 cm x 20 cm metalsheet are joined to form the vertical surfaces of a square base prism. What is the volume of the prism? what is the area of metal sheet required to make the top and the bottom of the prism.

**statistics**

A basketball player makes 60% of the free throws that he attempts, except that if he has just tried and missed a free throw then his chances of making a second one go down to only 30%. Suppose he has just been awarded two free throws. Find the probability that he makes both. ...

**Algebra 2**

thanks scott

**Algebra 2**

Lines x + y = 12 , x + y = 12. Are they parallel or other? is it parallel?

**maths**

A(–4, 3), B(3, 7), C(0, –1) and D(–7, –5) are the vertices of a parallelogram on the Cartesian plane. Determine the coordinates of the point where the diagonals of ABCD intersect.

**Algebra 2**

thanks steve

**Algebra 2**

how can u tell if a equation is liner?

**Physics**

100 - (80m/sec times 20 sec)

**Physics**

An astronaut constructs a pendulum with a length of 1 meter on a new planet. If the period is 3.9 second, what is the acceleration due to gravity? Can someone help me with formulas to determine this?

**Physics**

80 x 41 x .129 wrong 80 x 41 x .03 wrong Thanks

**Physics**

I understand the formula. I haven't been able to get a correct answer. I don't know what I'm doing wrong. Thanks though.

**Physics**

How many calories will it take to raise the temperature of a 41 g gold chain from 20°C to 100°C? The answer is 102 calories. I've tried everything and can't come up with that answer. Does someone have any idea what was used for a formula? Thanks

**Math (Quadratic Equations)**

Two pipes that are open at the same time can fill a pool in 12 hours. When only Pipe A is open, it can fill the pool 7 hours longer than when only Pipe B is open. Find how long Pipe A can fill the pool when it is the only pipe open?

**Physics**

I've tried everything and can't come up with the correct answer. Help! A liter of water has a mass of 1 kg and the mass of a water molecule is 18 amu. How many molecules of water are there in 4 L of water?

**Physics**

Thanks much. This is what I needed to understand.

**Physics**

I don't understand your question, however here are other parts of the same question and the answers are correct. All on the same 1 meter stick. Assuming g=10m/s/s: 500g weight on the right end of the stick; torque = 5 Nm. 750g weight on the right end of the stick; torque...

**Physics**

Find the torque on the meter stick for each situation. Ignore the mass of the meter stick. At 1/2 meter there is a 1000g weight. At 1 meter on the same stick there is a 500g weight. What is the torque? Not understanding how to come up with this answer. Keep getting it wrong.

**Sociology**

If you could make changes with regard to our social class stratification system, what changes would you make and why?

**Math**

Sove the inequality x+2/4-x+1/3>1/2

**math**

(7,000)(20,000) write in scienfic notation

**calculus**

haha is this for 16a?? same question :P

**english**

The of broken glass followed the of the bullet as the rifle . The soldiers were awakened by the of the bugle

**Algebra**

D = independent variable P = dependent variable 3d+9p=x

**Math**

-6

**Math**

The difference of a number and its opposite is 28. Find the number

**Chem**

mass of hydrogen/mass of compound times 100 to get %

**Math**

A large standard deviation occurs when the data has a large spread of data points. This might happen with the heights of students in grades K - 12 A small standard deviation might be the heights of students in grade K. b) will have both larger prize amounts than a and smaller ...

**Math**

x + y =20 5x -1y =70 x = # correct y + # wrong. add the two equations together since the y's will cancel. 6x = 90 x = 15 correct how many are wrong?

**Math, Please Help**

I just did this above.

**Algebra**

fee = flat rate + ___ per mile times miles. You need to find a current rate using the internet. repla

**Math**

The e is supposed to be theta.

**Math**

Given that tanè = -5 and è is in the 2nd quadrant, compute exactly: A. sin(è) B. cos(è) C. tan(2è)

**math**

The widths of two similar rectangles are 16 cm and 14 cm. What is the ratio of their perimeters? Of their areas?

**Math**

36 km/hr times 1 hr/3600 sec I used 3600 because there are 60 min in 1 hour and 60 sec in 1 min. 36 km/3600 sec times 10 sec 360/3600 = he would be 1/10 or .1 km The tortoise takes 2 hours to go 1 km rate is .5 km/ hour chance to kim/sec .5/3600 tortoise'rate He has to ...

**Math**

(72 +x)/2 =81 Multiply both sides by 2 and subtract 72 to get ... 81(2)-72

**science**

KE = 1/2 mv^2 1/2 his mass times velocity squared.

**Math**

What?

**Math**

Create a rational function with a linear binomial in both the numerator and denominator. Part 1. Graph your function using technology. Include the horizontal and vertical asymptotes and the x- and y-intercepts on your graph. Label the asymptotes and intercepts. Part 2. Show ...

**Science**

d = rt d = 100 times 64 answer is in km.

**mathematics**

That is the answer, but your teacher might not want to see the word "squared" written. I just did that for you for clarity.

**mathematics**

Your teacher wants you to check that (x − y)^2 = x^2 − 2xy + y^2 We showed that 900= 900 It was a lot of work, but proved the equation works.

**mathematics**

30 squared = 900 Now, look at the other side of the equation. 40 squared = 1600 2(40)(10) = 800 10 squared = 100 1600 - 800 + 100 = 900

**mathematics**

30 40-10 (40-10)^2 = 40^2 -2(40)(10) + 10^2 Can you finish from here?

**Math**

I agree with D.

**Pre-Cal: Domain**

The denominator cannot = 0 For f(x) x cannot = 0 for g(x) x cannot = -7 1) If you add the two fractions together, the denominator will be x(x+7) Domain would be from (-infinity, -7)U(-7,0)U(0,infinity) Using ( ) because those values aren't included in the domain. 3) you ...

**basic science**

work = force x distance Multiply the two values.

**math/algebra**

ratio (2(lw+wh+lh)/lwh

**physics**

A large aquarium has viewing ports so people can watch dolphins swim by. What is the net force on a rectangular window, 2.30 m wide and 1.20 m high, if the top of the window is 4.50 m below the surface of the water?

**Math**

5 times 24 divided by 6.

**Biostatics**

45-48 divided by 3 -1 = z score find z< -1 use a z-table or a calculator to find the p-value which is 15.9%

**Science**

change in y / change in x (2--4)/(3-1) or (2+4)/(3-1) 6/2 = 3 that is the slope of the line. Now, you can find the equation y -2 = 2(x-3) simplify and finish. Leave your answer in ax+by = c or y = mx+b form.

**Math (Circle Equations)**

I agree. I would just write 2^2 as 4.

**Math help plz??**

I'm not right, I'm just so ugly, I want to ruin other students life's. So plz, I'm just the worst!!!!!!!!!

**th help plz??**

(3.54 x 10^7) divided by (3.00 x 10^8) divide 3.54 by 3.00 = 1.18 10^7-8 = 10^-1 1.18 x 10^-1

**Pre-Calculus**

With linear programming, you have to graph each of the equations. x<=y also is needed along with your other equations. Shade in the correct area for the inequalities and look at your intersection points.

**math143**

Are you looking for the x and the y intercepts? if so, let x = 0 and solve for y let y = 0 and solve for x. 4y = 18 -5x = 18 Can you finish from here?

**math143**

Find the way intercepts for 4y-5x=18

**math143**

A. Substitute those values into the equation, simplify does the left side = -167 b. again, put both values into the equation. Does the left side = 51, if so.. it is a point on the graph. to find the y intercept. Let x = 0 and solve for y.

**math143**

2x3-4x2+23=y A.is(-4,-167) a solution? Show/explain b.is(3,51) a point on the graph c.give the y-intercept