# Posts by Sam

Total # Posts: 5,189

**calculus**

given the velocity of a particle traveling along the y-axis by v(t)=tsin(t^2)

**math**

thank you Ms. Sue. I get mixed up a lot with these kind of problems. you really break it down to be able to understand. thank you

**math**

please help on this problem. -2x+4(3x-4)=84. cant get the answer. thank you

**chemistry**

could one separate the components of a mixture of PbCl2 and Mg(OH)2 using only cold water?

**AP calculus**

If 54 J of work are needed to stretch a spring from 15 cm to 21 cm and 90 J are needed to stretch it from 21 cm to 27 cm, what is the natural length of the spring?

**AP calc**

If the work required to stretch a spring 2 ft beyond its natural length is 6 ft-lb, how much work is needed to stretch it 18 in. beyond its natural length?

**AP calc**

A spring has a natural length of 18 cm. If a 22-N force is required to keep it stretched to a length of 24 cm, how much work W is required to stretch it from 18 cm to 21 cm? (Round your answer to two decimal places.)

**physics**

A tire placed on a balancing machine in a service station starts from rest and turns through 4.93 revolutions in 1.47 s before reaching its final angular speed. Calculate its angular acceleration. It must be in units of radians. Please help. I have 20 attempts to do this and I...

**Math 12**

a) How many different sums of money can be made from a toonie, a $5 bill and a $10 bill. I think this equals 2^3-1 b) How many different sums of money can be made from the money in (a) as well as one more $10 bill? This should equal 11. c) Why does the situation become much ...

**math**

thank you so much .pemdas -I get it

**math**

HOW do I solve this equation? 6X -5(-X - 13)=131. WHAT IS THE RULE OF ORDER TO DO THIS? THANK YOU

**english**

Here is my work. She didn't have an expressive manner,so it was idle to attempt to ascertain the state of her affections.

**english**

Combine these sentences into one sentence using conjuctions,adverbal connectives to create compound sentence. It was idle to attempt to ascertain the state of her affections. She didn't have an expressive manner. Thank you.

**english**

Combine these sentences into one sentence using conjuctions,adverbal connectives to create compound sentence. The door opened. The crooked little cotton -eyed piano player stood in the entrance. He was waiting for a sound to tell him where she was. Thank you.

**math**

thank you

**math**

how do i do this equation ? -158=-2x+ 2(7x -7) . thank you

**Science**

An elastic cord of elastic constant k and length L is hung from point A having a massless block at the other end. A smooth ring of mass M falls from point A. What is the maximum elongation of cord?

**math**

thank you so much

**math**

Could you show me the work to get to the answer please? thank you

**math**

m-n divided by 4. use m =5 and n = 8. please help. ty

**Math**

a rectangular room on a blueprints is 2 inches wide and 5 inches longif the scale of the blueprints to the actual room is 1:72,what is the width of the room?

**Math**

yesterday, molly lunch cost $9.80 and she left a $1.49 tip, today molly lunch cost $12.60 if she tips at the same rate that she did yesterday how much of a tip should molly leave

**math analysis**

verify tan x/2=secx /secxcscx+cscx

**math**

How do I simplify this expression -2x +11 +6x . Thank you for help

**Math**

The dissipation of heat through a composite material of width w centimetres can be modelled by the function f(w)=10/w-0.77ln(w)–3.2 You are required to find the width of material that will prevent any heat dissipation. State what equation you will need to solve?

**math**

Tony is on his way home in his car. He has driven 12 miles so far, which is three-fourths of the way home. What is the total length of his drive?

**Health and PE**

I agree with bobpursley, BMR means the rate at which you use energy when your body is at rest. C. is the only one that makes sense.

**math**

A farmer wants to fence a small rectangular yard next to a barn. Fence for side parallel to the barn will cost 75 per foot and the fence for the other two sides will cost 30 per foot. The farmer has a total of 1750 dollars to spend on the project. Find the dimensions for the ...

**math**

The University of Oregon girls club soccer team is raffling off a bicycle to raise money for new equipment. If they charge 2 dollars per ticket, they will sell 600 tickets. For each 50 cent increase in ticket price, they will sell 30 fewer tickets. What ticket price should ...

**maths**

15?3/2

**Trigonometry**

someone answer pls

**Trigonometry**

Christian is between two tall buildings 10m away from the taller building if the angle of the top of the building from where he stands bears N8DEGREESW for the taller one and N10DEGREESE for other,how far is he from the other building if the taller building is 5/4 as tall as ...

**history ww1**

does anyone has any links with primary sources of the ww1?

**Math**

Three

**math**

4,812. Thank you

**math**

A box in the shape of a rectangular prism has a dimension of 30 meters x 27 meters x 28 meters. What is the surface area of the box?

**trig**

A man is between two tall buildings 8m away from the taller building. If the angle of the top of the building from where he stans bears N 8degrees W for the taller one and N 12degrees E for other. How far is he from the other building if the taller building is 6/5 as to the other

**trig**

sir steve ????

**trig**

explain sir :(

**phi 103**

Don’t you dare vote for universalized healthcare. (Points : 1) Proposition Non-proposition

**Physics**

Help I don't understand how to do this homework question, we didn't go over any like it in class. A car has an average speed of 80.0km/h for 1 hour, then an average speed of 90.0km/h for 2 hours during a 3 hour trip. what was the average speed for the 3 hour trip?

**phi 103**

For John Dewey, open-minded inquiry is: (Points : 1) The virtue that prevents habit from making us unwilling to hear other ideas Something only a child can do For people who are weak in their beliefs Reinforcing our own beliefs by talking with people who share those beliefs ...

**math**

Write a quadratic function rule for the given table in problems 4 and 5. 4. X (0, 1, 2, 3) Y (-6, -5, -7, 3) a. y= x-6 b. y= x-4 c. y= x^2 - 3 d. y= x^2 - 6 5. X(-1, 0, 1, 7) Y(5,4,5,8) a.y=x+4 b.y=x^2+4 c.y= x^2+6 d.y=x+6

**algebra**

in a triangle find the value of x when 7x + 3x + 90 degrees = 180 degrees

**physic**

A student stands on a rotating disk holding 4-kg objects with each hand. hen his arms are extended horizontally, the object are at 0.8m from the axis of rotation and he rotates at 0.7 rad/sec. The moment of inertia of the student plus the disk is 3.00 kgm^2 and is assumed to ...

**physic**

A 25 gm bullet is fired into a 2.25kg ballistic pendulum and becomes embedded in it. If the pendulum moves a vertical distance of 10cm, calculate: A. The speed of the system after collision B. The initial speed of the bullet C. The percentage of the energy lost in the process.

**physic**

A 0.25-kg punk, Initially at rest on a frictionless horizontal surface, is struck by a 0.20kg punk that is initially moving along the x-axis with a velocity of 2.20 m/sec. After the collision, the 0.20 kg punk has a speed of 1.5 m/s at an angle of 37 to the positive x-axis. ...

**Chemistry**

This site it terrible... for everything. Not helpful at all. Thanks....

**linear algebra**

Which of the following homogeneous systems have a nontrivial solution? 5x+ y + 5z =0 −2x + 2y− 4z = 0 4x− 3y + 6z = 0 can someone please explain how you know

**math**

nevermind i got that, can someone help me with this Find the values of a and b that make f continuous everywhere. f(x) = x2 − 4 x − 2 if x < 2 ax2 − bx + 3 if 2 ≤ x < 3 4x − a + b if x ≥ 3

**math**

limit as x --> ininity of (5-e^x)/5+ 3e^x

**chemistry**

Your calculations are precise; however, your final calculation is 9700 J. You are answering as kJ. You must convert to 9.70 kJ.

**Chemistry**

A certain reaction has an activation energy of 58.80 kJ/mol. At what Kelvin temperature will the reaction proceed 6.50 times faster than it did at 303 K?

**Algebra 2!!!!**

Use the graph to shorten the list of possible rational zeros of the function. Then find all real zeros of the function. 1.) f(x)= 4x^3-8x^2-15x+9 4.) f(x)= 2x^3-5x^2-4x+10

**Physics**

1) If = 2.0 cm, due E and = 5.0 cm, due W Determine: a) R = -A + 2B b) V = - 2A - B c) F = 3A - B My Answers R= 8, V= -1, F= 1 Is this correct and how do you know when direction it's going to be?

**art**

No that is not an answer they give

**physics**

Two point charges are placed at two of the corners of a triangle (Take q1 = -10.2 µC, and q2 = 16.3 µC.) Find the magnitude and the direction of the electric field at the third corner of the triangle.

**Math**

What is 4+ 1000000.

**math**

The answer is 63

**chemistry**

How many moles of lead iodide are produced from 300. g of potassium iodide? Usie the reaction below. PB(NO3)+ KI = Ni9OH)2 + NaNO3

**Math**

sam travelled 1/4 of a journey by bus. He jogged 1/2 of the remaining distance and walked the rest of the way. If he walked 800 feet, what was the total distance he traveled?

**math**

Evaluate the limit using the appropriate Limit Law(s). lim t → 2 of (t^44 − 9)/ 2t^2 − 3t + 7

**crime**

I need to find facts on this so I am able to cite it in a paper

**crime**

How might a news company’s political alignment alter its presentation of crime in America?

**linear algebra**

If A is an n × n matrix, then A = S + K, where S is symmetric and K is skew symmetric. Let A= [1 3 -2;4 2 2;5 1 2] Find the matrices S and K described above can some0ne explain how to get these two matricies? thanks

**Chemistry**

Consider the titrtation of 25.0mL of 0.0100M Sn2+ by 0.0500M TI3+ in 1 M HCL, using Pt and Saturated Calomel Electrodes to find the endpoint. F=96486.7 Cmol E0 Sn4+/Sn2+ =0.15V E0 TI3+/TI+ = 1.28 Esce = 0.241V R=8.3141 J K Mol (D) calculate E at the following volumes of TI3...

**Chemistry**

19,103

**Chemistry**

A solution contains 1.694 mg of CoSO4 (MW 155.0) per mL. Calculate a) The volume of 0.008640 M EDTA needed to titrate a 25.00 ml aliquot of this solution. Step 1. 0.001694g * 25ml * 1/155 g/mol= 0.0002732 mol Step 2. Volume of EDTA needed = 0.0002732 mol/ 0.008640 M = 0.03125 ...

**Chemistry (Re-post)**

A solution contains 1.694 mg of CoSO4 (MW 155.0) per mL. Calculate a) The volume of 0.008640 M EDTA needed to titrate a 25.00 ml aliquot of this solution. So this is my working out for this section, Step 1. Moles of CoSO4 = 0.0001694mg * 25mL * (1mol/155g/mol) 2.732*10^-4. ...

**Pre-Calc**

The concentration C of a chemical in the bloodstream t hours after injection into muscle tissue is C=3t^2+t/ t^3+50 A. Determine the horizontal asymptote of the function and interpret its meaning in the context of the problem. B. approximate the time when the bloodstream ...

**Pre-Calc**

A company produces portable cassette players estimates that the profit P (in dollars) for selling a particular model is P=-76x^3+4830x^2-320,000, 0 ≤ x ≤ 50, where x is the advertising expense (in tens of thousands of dollars). Using this model, find the smaller of...

**Chemistry**

A solution contains 1.694 mg of CoSO4 (MW 155.0) per mL. Calculate a) The volume of 0.008640 M EDTA needed to titrate a 25.00 ml aliquot of this solution. moles CoSO4 = 0.001694mg/ 155 g/mol = 1*10^-6 mol Moles EDTA = 1*10^-6mol/0.025L = 0.000436 mol/L (in 25 mL) This is where...

**computer graphics**

Write an OpenGL program that allows interactive creation of polygons via mouse input. That is, I click to create new vertices until I like the polygon, then make some indication (double click, right click, press a key, click a button; your choice) that I’m done, and the ...

**math**

thanks

**math**

what i am just saying am i right

**math**

am i right ms sue

**math**

are u sure i am right

**math**

ms sue

**math**

please i neeeed help i think a but i not 100% sure

**math**

please help ms sue please or any body

**math**

what is the ratio of the measurements 6/12=2.5/5 in simplest form a.2:1 b.6:12 c.1:2 d.none of these

**math**

ok now can u look at the new question i put up please

**math**

here it is ms sue

**math**

there is to right traingles and we have to find the missing side the first traingle has 4 on the bottom and 2 as its height the second trangle has a 9 on the bottom and the x as the height which number is x. a.4.5 b.18 c.8 d.2.25 i think a

**math**

what do u think on the 2 one ms sue

**math**

im i right on these questions

**math**

so the first question is a

**math**

could you help with this one there is to right traingles and we have to find the missing side the first traingle has 4 on the bottom and 2 as its height the second trangle has a 9 on the bottom and the x as the height which number is x. a.4.5 b.18 c.8 d.2.25 i think a

**math**

i think it is d

**math**

ms sue please help

**math**

12/6 =5/2.5 a.2:1 b.6:12 c.1:2 d.none of these

**ss**

please

**ss**

could u help me ms sue

**ss**

do u know this question ms sue math 12/6 =5/2.5 a.2:1 b.6:12 c.1:2 d.none of these

**ss**

thanks

**ss**

am i right ms sue

**ss**

one is d and 2 is a

**ss**

i think a for the 1 one and b for the second one

**ss**

there is the 2 question

**ss**

why is the work session for legislators 40 day? a.legislators were meant to hold other jobs not be career politicians b.state business takes a short time to complete c.it gives legislators time to campaign for re election d.it allows representatives to work closely with ...