Thursday

January 19, 2017
Total # Posts: 3,625

**Physics**

Let's start by converting everything to SI units. 15 m/hr/s = 6.71 m/s/s 65 m/hr = 29.1 m/s We have constant acceleration, so we can use our constant acceleration kinematic formulas. Here we initial velocity, final velocity, acceleration, and want time so we use v(f) = v(i...

*April 20, 2016*

**Statistics**

The probability of our event occurring is .8. We construct a binomial distribution, with 4 trials, of which we want 3 to occur. B(4, .8) P(3) = .4096

*April 19, 2016*

**Math**

Multiply both sides by 3729, yielding 3729tan(7)

*April 19, 2016*

**Math**

Actually, wait. You should be using tan, since you're given the adjacent side. (The lesson here: always draw a picture.) 120tan(36).

*April 19, 2016*

**Math**

The transit here is extraneous information-- it's simply a device used to measure angles (I assume). We know that the base of the right triangle is 120 feet. (Notice that the transit of 8ft is nonsensical in this problem doesn't make sense because we're solving for...

*April 19, 2016*

**Math**

Perimeter is the sum of all sides. For a rectangle, P = 120 = 2L + 2W. You are given that L = 3n W = n, so you can now do a substitution into the perimeter equation: 120 = 2(3n) + 2(n). Simplifying this, we get 120 = 8n, so n = 15. Revisiting our length and width equations, L...

*April 19, 2016*

**Math**

1/15.5 = 2/31

*April 18, 2016*

**computer science**

What specific part are you having trouble with? The packages? File I/O? What language?

*April 18, 2016*

**calculus**

Between y = 2x2 + 9x − 4 and y = −x2 + 6x + 2 for x in [−2, 2]

*April 18, 2016*

**Language Arts**

You are correct. :-) A conjunction joins two parts of a sentence together. A better example to describe this would be "Alice bought a calculator, and Ben bought a mouse." The conjunction "and" divides the sentence into two thoughts-- "Alice bought a ...

*April 18, 2016*

**math**

Set up a proportion: If Bill can type 10 pages in 24 minutes and we want to know how many pages he can do in 5.5 hours (330 minutes), a possible proportion is: 24/10 = 330/x Cross-multiplying we get 24x = 3300, so x = 3300/24 = 138 pages.

*April 17, 2016*

**Algebra**

The easiest way to justify this is to visualize the graph. We know from the first the signs of this equation that this quadratic opens upwards and know that it is shifted to be above the x-axis, so the quadratic never crosses the x-axis and therefore has no roots. You could ...

*April 17, 2016*

**Math grade 7**

Net daily change is revenue - expenditures, 12500 - 15000 = -2500. The overall change in the treasury's funds is 1.1Mil - 1Mil = 100K. To find out how many days, we divide the overall change by the net daily change in revenue: 100K / 2500 = 40 days.

*April 15, 2016*

**Translating a sentence into a one-step equation**

60 = v - 13

*April 15, 2016*

**Algebra 2**

If it's multiple choice, plug and chug those points. Otherwise, you have two options: 1) Quadratic Regression 2) Conics I opt for quadratic regression given that I've not done conics in three years, lol f(x) = -x^2 + 5x -4

*April 15, 2016*

**Translating a sentence into a one-step equation**

g + 17 = 46

*April 15, 2016*

**Reverse math confused**

Her preliminary cost (prior to tax and tip) is regular price (p) - 2. Tax and tip is 20% of this preliminary cost, so total cost is 9 = 1.2(p - 2). p = $9.50. (Nice coupon, there...)

*April 15, 2016*

**Math**

We know that after cutting 1/3 of the coil and 8m of the coil, 1/2 of the coil remains. This can be written as 1/3 + x = 1/2, where x will be 1/6. We know that this 1/6 of the coil is 8m, so the total length of the coil is 8 * 6 = 48m because one coil = 6 subcoils each of 8m.

*April 14, 2016*

**physics**

Where is Q located? I'll explain how to do this, since I don't know enough about this problem. Solve for the the bob's velocity right before it hits ball Q using energy equations: U(bob) = KE(bob) + U(Q). From here you can use your elastic equations to solve for ...

*April 14, 2016*

**math**

The volume of the tank is 3885 cubic centimeters. Volume is equivalent to length * width * height, in which you are provided both length and width. Your equation becomes 3885 = 18.5 * 15 * height Solving this, we get height = 14 cm.

*April 14, 2016*

**Quadratic Equations**

A quadratic equation's shape is a parabola. So anything with a curved trajectory would fit: throwing a ball / javelin / football / anything, shooting an arrow... Here's a fun picture: prntscr . com / arm214

*April 13, 2016*

**test corrections for problems 6,11,12 and 23please**

We want f(x) - g(x) and are given both equations. All you have to do is substitute: 9x^3=2x^2-5x+5 - (5x^3-7x+4) Be sure to distribute that negative sign! (I'd give you an answer but I'm not sure what that equals sign is supposed to be?)

*April 13, 2016*

**test corrections for problems 6,11,12 and 23please**

The sphere question is very similar to the cylinder question. Stick the provided value r into the provided surface area equation. SA = 4pi(2x+5)^2 Here you distribute / foil (2x+5) out when expanding, yielding 4pi(4x^2 + 20x + 25). Again, you should multiply each term by 4pi ...

*April 13, 2016*

**test corrections for problems 6,11,12 and 23please**

Oops. Add an x^2 to my previous answer. I wasn't sure why we had random x's in the problem, so I just dropped them. You're given the radius and the height of the cylinder. Simply stick in the given values into the provided formula and solve, yielding pi(80x^4 + 64x...

*April 13, 2016*

**test corrections for problems 6,11,12 and 23please**

A picture is helpful. Start by drawing the 8 by 12 lot. The field must fit in this lot and is 3 by 6. The area that is not the field is the remaining area. This is a simple area calculation. Total area of the lot is 8 * 12 minus the area of the field, 3 * 6. The remaining area...

*April 13, 2016*

**Math**

Yes, 76%.

*April 13, 2016*

**Integers**

From the problem statement, we know that some 6 integers must sum to 171. To get an idea of what these numbers are, start by dividing 171 by 6. This yields 28.5, which is what the average of our numbers are. Here we can construct numbers close to this interval-- the problem ...

*April 12, 2016*

**Maxima and minima Application**

This is a parabola, so it can either open upwards and have a min but not a max or open downwards and have a max but not a min. From the sign of the leading term (+1), we know this opens up. The minimum position of this parabola would be the point of symmetry. To find this, we ...

*April 12, 2016*

**math**

From the prompt, we know that: a) L = W + 2 b) Perimeter = 28 = 2L + 2W Where I call breadth W The easiest way to solve this system is by substitution. Plug in (a)'s value of L into b, yielding 28 = 2(W+2) + 2W. From here, isolate and solve for W. You should get W = 6cm. ...

*April 12, 2016*

**Math**

1) Picture the equation. It must decrease at an unknown rate, then flatten out as it nears 60K (asymptote). This would be in the family of functions of 1/x because 1/x is the most common function to have asymptotes, which Google seems to call power / reciprocal / rational / ...

*April 12, 2016*

**Math**

175 / 625 = 28% (What kind of party lasts 6 hours?)

*April 12, 2016*

**Math**

Only a dilation would change the shape's dimensions-- any type of shift would simply relocate the shape. We must only prove that dilation do not change the concurrency. Dilations, by definition scale on object-- if you dilate it by 2, the second image will be exactly twice...

*April 12, 2016*

**Science**

A - True. B - False. ATP -> ADP releases energy. C - False. ADP -> ATP represents storing energy. (Also you can't "break down" ADP into ATP.) D - False. Glucose and ADP / ATP can both store energy.

*April 12, 2016*

**physics**

A) This is a conservation of energy problem, so E(i) = E(f). I'll pick our point of origin to be the spring's equilibrium height-- this makes the gravitational potential energy of the ball easy to calculate. We now identify what types of energy are present at the ...

*April 12, 2016*

**Math**

Start by calculating the area of the desk. Area of a rectangle is base x height, 5.5 * 3.5 = 19.25 ft^2. Now calculate the area of the tile: .5 * .5 = .25 ft^2. To figure out how many tiles can fit, divide the area of the desk by the area of one tile: 19.25 / .25 = 77 tiles.

*April 12, 2016*

**math polynomials**

I'm assuming you're solving for x? Set each term in parentheses equal to 0, yielding: ~ 3x + 4 = 0 ~ x - 2 = 0 Now isolate x and solve. For the first equation, this would be subtracting 4 from both sides, then dividing by three. x = -4/3, 2

*April 12, 2016*

**PHYSICS Momentum!! Collision HELP**

Your assumption is correct. If you simply choose initial to be "before the collision," a) P(iA) = 0.202 * 2 P(iB) = 0 b) KE(iA) = .5 * .202 * (2)^2 KE(iB) = 0

*April 12, 2016*

**Linear Algebra**

p1, p2, p3 are elements of P_2 p1(x)= 1+x-2*x^2 p2(x)= 2+3x-x^2 p3(x)= 3+5x-x^2 Is S = {p1, p2, p3} linearly independent?

*April 10, 2016*

**math**

Take natural log of both sides. therefore ln(15)=ln(2^x) move x to the front ln(15)=x*ln(2) move ln(2) to the other side therfore x=ln(15)/ln(2) write all this down on paper to see it properly.

*April 10, 2016*

**Algebra**

A basketball player makes 53 points on 24 shots. How many 3 pointers and 2 pointers did he shoot. Show your work. I know that the answer is 5 for the 3 pointers and 19 2 pointers but I don't know how to show it.

*April 7, 2016*

**Science**

PLEASE HELP 1. Katie is bowling. She starts with the ball in her right hand and her arm as far back as it will go. She swings the ball forward, applying a force of 78 Newtons the whole time. When her hand has traveled through a path of 0.9 meters, she releases the ball, and it...

*April 4, 2016*

**Chemistry**

What is the pH of the solution when 50.00 mL of 0.250 M HNO3, nitric acid, has been treated with 25.00 mL of 0.400 M NaOH? Below is the work I performed, however, my professor deemed the [H3O] as incorrect. Where did I go wrong? [NaOH] = .025 L x 0.400 M = .010 mol [HNO3] = ....

*March 30, 2016*

**Derulo**

13 more than the product of M & 5

*March 29, 2016*

**Check my answers for world history please!**

Good

*March 29, 2016*

**The 5th Wave**

Yes yes and yes

*March 29, 2016*

**math**

All of these answers are wrong, the real answer is 9 because: 36*0.2(20%)=7.2, this is how much water the berries obtain. Now you do 7.2 divided by 0.8 which equals 9 -you do this step to find out how much water and the rest of the stuff in the berries. By the way i'm in ...

*March 27, 2016*

**math**

Marcela 27 donuts from Dunkin Donuts. She ate one ninth of the donuts. She took the remaining donuts and shared them equally amongst 12 classmates. How many donuts did each friend receive?

*March 21, 2016*

**math**

Marcela 527 donuts from Dunkin Donuts. She ate one ninth of the donuts. She took the remaining donuts and shared them equally amongst 12 classmates. How many donuts did each friend receive?

*March 21, 2016*

**math**

Alex bought 27 donuts from Dunkin Donuts. He ate 1/9 of the doughnuts. He took the remaining donuts and share them equally amongst 12 classmates. How many donuts did each friend receive?

*March 21, 2016*

**Math**

A hospital was out of juice at the end of September. They bought 200 cases on October 1 at $10/each and 200 more cases on November 1 at $12. There were 100 cases left at the end of October. What is the total of the first case expensed on November 2nd?

*March 18, 2016*

**Math**

A hospital was out of juice at the end of September. They bought 200 cases on October 1 at $10/each and 200 more cases on November 1 at $12. There were 100 cases left at the end of October. What is the total of the first scare expensed on November 2nd?

*March 18, 2016*

**Physics**

A body of mass 10g oscillates with Simple Harmonic Motion of amplitude 4cm and time period 0.50s. Calculate: a) The maximum acceleration. b) The maximum kinetic energy.

*March 13, 2016*

**Spanish**

2)descanso 3)retirarse 4)madrileños

*March 12, 2016*

**intro to physic fundamentals**

the speed of a roller coaster that had descended 29.0 m was only slightly greater when it had an initial speed of 5.00 m/s than when it started from rest. This implies that ΔPE KEi. Confirm this statement by taking the ratio of ΔPE to KEi. (Note that mass cancels.)

*March 4, 2016*

**phliosophy( justifying using the rule of inference**

1.) A > B 2.) B > C 3.) ~C.D //:. ~A

*March 2, 2016*

**trigonometry (Course and Bearing)**

how do you sketch this kind of problem?, that's the reason why i'm having trouble with this ..

*March 2, 2016*

**trigonometry (Course and Bearing)**

two lighthouses are situated such that B is 7 km directly east of lighthouse A. A ship at point P observes that A is due north and that the bearing of B is 46°10'. How far is the ship from A and B ?

*March 2, 2016*

**Social Studies**

I think so. wait to see what reed says

*March 1, 2016*

**Social Studies**

its not my social studies. it is Ann

*March 1, 2016*

**Social Studies**

The 1868 state constitution for South Carolina was revolutionary because it embodied many democratic principles absent from previous constitutions. The new document provided for population alone, rather than wealth or the combination of wealth and population, as the basis for ...

*March 1, 2016*

**Geography and Society**

Without the atmosphere that protects the Earth, humans, animals and all plant life would not be able to survive. The atmosphere works to hold oxygen in the area around the earth. Humans and most animals are dependent on oxygen. Plants are also dependent on oxygen because they ...

*March 1, 2016*

**Math**

I'm a student

*March 1, 2016*

**Math**

It is 62,370mm

*March 1, 2016*

**Maths**

OK?

*March 1, 2016*

**Maths**

A proportion is a name we give to a statement that two ratios are equal. It can be written in two ways: •two equal fractions, or, •using a colon, a:b = c:d When two ratios are equal, then the cross products of the ratios are equal. That is, for the proportion, a:b = ...

*March 1, 2016*

**Maths**

Explain how to do the problems?

*March 1, 2016*

**Math**

Muesli can make 260 grams with the dried fruit and wheat flakes. Problem 1 Answer

*March 1, 2016*

**Math**

A bakery sells apple pies for $12 each and pumpkin pies for $15 each. In one day, they make $100 from selling apple and pumpkin pies. Write an equation to show how apple pies a and pumpkin pies p are related to money the bakery made.

*March 1, 2016*

**Chemistry (stoichiometry)**

22 moles of benzene are completely reacted with molecular oxygen, how many moles of carbon dioxide will be produced? and if 150 grams of water were produced, how many moles of oxygen must have reacted

*March 1, 2016*

**philosophy( symbloic logic)**

P, Q, R = 1 x, Y, Z = 0 _____ 1) ~(x.y) V (R.Q)

*March 1, 2016*

**Math**

You save half of the money from your paycheck plus an extra six dollars to buy a new bike. Write an expression for the amount of money you save from each paycheck

*February 23, 2016*

**Mayh**

The height of a ball thrown straight up from the ground into the air at time 't', is given by: h=8t-10t^2 What is the time to go up and fall to ground

*February 23, 2016*

**English**

Which sentence contains an indirect object? a. The radio warned us of the storm. b. The police gave everyone three hours to evacuate. c. Carl remained at home on the island. d. He escaped the storm in a boat.

*February 23, 2016*

**oblique triangle**

C = 38.667, b = 9.72, c = 11.8

*February 22, 2016*

**oblique triangle**

C = 20.83, A = 103.167, c = 132

*February 22, 2016*

**oblique triangle**

reiny, am i doing it right ?? AB = 12.57(sin 54.23)/sin 57.36 = 12.11

*February 22, 2016*

**oblique triangle**

reiny am i dooing it right ?? AB = 12.57(sin 54.23)/sin 57.36 = 12.11

*February 22, 2016*

**oblique triangle**

B = 68°24'36", C = 54°13'48", b = 12.57

*February 22, 2016*

**Discrete Math**

Let A = {x ∈ R| cos x ∈ Z}, B = {x ∈ R| sin x ∈ Z}. Is A ⊆ B? Is B ⊆ A? Is either A or B a proper subset of the where other?

*February 22, 2016*

**algebra 1**

-1

*February 18, 2016*

**chemistry**

If a solution containing 22.34 g of mercury(II) perchlorate is allowed to react completely with a solution containing 6.256 g of sodium sulfate, how many grams of solid precipitate will be formed?

*February 14, 2016*

**Math**

156-127=29

*February 12, 2016*

**trigonometry (Trig Equation)**

sin 3x=-1

*February 12, 2016*

**trigonometry (Trig Equation)**

4 cos 2x + 3 cos x = 1

*February 11, 2016*

**Math**

For these problems the instructions say to tell whether each scale reduces, enlarges, or preserves the size of the actual object. Here are my problems and answers: 1. 10 cm: 1 dm Ans: reduces 2. 3 ft:3 yd enlarges 3. 5 km: 5 m enlarges 4. 1760 yd: 5280 ft reduces

*February 7, 2016*

**Physics**

Roxanne is making a strawberry milkshake in her blender. A tiny, 0.005-kg strawberry is rapidly spun around the inside of the container with a speed of 14.0 m/s, held by a centripetal force of 10.0 Newtons. What is the radius of the blender at this location?

*February 4, 2016*

**Math**

5) Write an equation in point-slope form with the given: (5,-8),(5,8) 8) Write an equation in slope-intercept form for a line that passes through the point (2,-5) and is parallel to y = 11 : )

*February 2, 2016*

**Math**

correct, A

*January 29, 2016*

**physics**

A 1200kg car moves along a horizontal road at speed v0=23.3m/s,the road is wet, so the static friction coefficient between the road and the tires is only µs=0.209 and the kinetic friction coefficient is even lower µk=0.1463. The acceleration due to gravity is 9.8m/...

*January 25, 2016*

**math**

During a windstorm, part of the top of a flagpole breaks off. The broken top portion touches the ground at an angle of [c]5 deg 1[e] feet from its base (Note: if [e]=6, then 1[e]=16, and if [c]=3, then [c]5°=35°). how tall was the pole before the windstorm

*January 24, 2016*

**chemistry**

does it take time for oxygen and hydrogen to mix beucase of the room temperature?

*January 24, 2016*

**chemistry**

why is there no pop of pure oxygen and pure hydrogen?

*January 24, 2016*

**Geology**

(Magnetic inclination vs. latitude graph). Two igneous rocks crystallized at different times at the same geographic location on a continent. One rock crystallized at 120 Ma and records a magnetic inclination of 68 degrees; the second rock crystallized at 65 Ma and records a ...

*January 22, 2016*

**chemistry**

thanks bob

*January 22, 2016*

**chemistry**

what would be the name for these compounds? K3PO4? It's not Tripotassium phosphate. HCL? its not Hydrogen chloride.

*January 22, 2016*

**trigonometry**

tan3θ = 3tanθ - tan^3θ/ 1-3tan^2θ

*January 21, 2016*

**Pre Calc**

Find the vaule of sec(theta) for angle theta in standard position if the point at (3,-1) lies on its terminal side.

*January 18, 2016*

**Math**

Shadontay is going to the movies with two friends he buys a small popcorn that cost $2 the tickets and 1 popcorn cause a total $29 how much does one ticket cost

*January 18, 2016*

**Chemistry**

If a solution has a large Kb value, will it have a high pH?

*January 17, 2016*

**geometry**

thanks

*January 16, 2016*