Friday
April 18, 2014

Posts by Sarah


Total # Posts: 3,751

Calculus
Determine the value of k, so that u = [-3,7] and v = [16,k] are perpendicular.

Calculus
Differentiate each function a) y = Cos³ x b) y = Sin(x³) c) y = Sin²xCos3x

Calculus
Evaluate, rounding to two decimal places, if necessary a) ln 5 b) ln e² c) (ln e)²

Calculus
Determine the equation of the tangent line to the curve y = 2x²-1 at the point where x = -2

Calculus
Differentiate each function a) y = -3x^2 + 5x - 4 b) f(x) = 6/x - 3/(x^2) c) f(x) = (3x^2 - 4x)(x^3 + 1) thank you in advance :)

physics
a 1.0kg ball is thrown upward from 1.0m above the ground with a speed of 10m/s reaches a height of 4.5 m. what is the efficiency of the energy transformation?

DeskToping
The ______ finger is used to key an ampersand. A. A B. D C. J D. Sem I got D.

statistics
Suppose a box has eight differently colored tennis balls in it. The colors are green, blue, red, purple, orange, black, and white. if I will randomly pick out three balls (without replacement), then what is the probability that the balls chosen will be green, yellow, and red (...

Desktoping
The ______ symbol is used to represent mulitipication A. Asterisk B. At (@) C. Number (#) D. Tilde (~) I got C.

DeskToping
Yes i did sorry. Thank you :)

DeskToping
The _______ symbol is contained on the numeric keypad. A. ) B. % C. + D. $ I got C. If you press the down-arrow key ( ): A. You will jump to the previos page B. You will jump to the next page C. The inseration point will move down one line D. The inseration point will move to ...

calculus
It looks like you just need product rule. Start with the e^(3x). Keep it like that the multiply by the derivative of that sec function which is then sec(7x)tan(7x) . Next add the derivative of the e^(3x) times the regular function from the sec function. So step two is +3e^(3x)...

Desktoping
Press ____ to copy selected text to the clipboard *

Desktoping
In a bibliography, each source should be formatted using a ____ indent. A. center B. hanging C. left D. right I got D. Press ____ in copy selected text to the clipart A. Ctrl + A B. Ctrl + B C. Ctrl + C D. Ctrl + D I got A.

Chemistry
How many moles of H2SO4 are required to react with 50 mL of NaOH solution? NaOH is 1M.

DeskToping
Tgere should always be _______ spaces (s) after the period at the end of a sentence. A. 1 B. 1.5 C. 2 D. 2.5 I got A. To key a capital letter K, hold down the ____ key while pressing K key. A. Right Shift B. Right Alt C. Left Shift D. Left Alt I got C.

DeskToping
Thank You. And is "B" number one ?

DeskToping
If you press the ______ key , you will jump to the previous screen. A. Page Down B. Page Up C. Home D. End I got C. You should _______ insert a blank space before the percent symbol. A. always B. not C. occasionally D. NONE OF THE ABOVE I got B.

DeskToping
Oh excuse me i meant "D" for number three. Thats correct ?

DeskToping
Always keep your _____ straight when holding the mouse. E. arms F. back G. wrists H. ALL OF THE ABOVE I got G. The ______ finger used to key the asterisk symbol. A. S B. F C. K D. L I got C. The _____ keys are used to key symbols such as $ and % A. Alt B. Ctrl C. Funchtion D. ...

DeskToping
Thank You :)

DeskToping
Use your _____ finger to key the number zero (0) I. Sem J. K K. F L. A I got I. All of the following should always be capitalized. EXCEPT. M. Months N. Proper names O. Seasons P. Titles I got O.

DeskToping
_____ are symbols used to indicate changes that need tobe made to text. A. Proofreaders marks B. Correction Marks C. Insertion Marks D. Preview symbols I got A.

Fundemental DeskTop
If you press the ______ key you will jump to the previous screen A. Page down B. Page up C. Home D. End I got B . You should ____ insert a blank space before the percent symbol A. Always B. Not C. Occasionally D. NONE OF THE ABOVE I got B .

Desktoping
The ____ symbol is contained on the numeric keypad. A. ) B. % C. + D. $ I got C If you press the down arrow key ( ): A. You will jump to the previous page B. You will jump to the next page C. The inseration point will move down one line D. The inseration point will move to the...

Fundemental Desktop
If you can help with the other questions ive posted please do :) <3

Fundemental Desktop
Thank you :')

Fundemental Desktop
Many*

Fundemental Desktop
when keyboarding, you ______ let your back rest againist the back of the chair Q. should R. Should not S. should sometimes T. NONE OF THE ABOVE I got Q . Mnay windows-based programs provide _______________. such as Ctrl+O to open a file. A. Icons B. Pop-ups C. Shortcuts D. Sof...

humam resources
What motivational factors can influence individual performance in the workplace? How can compensation programs be used to motivate individual performance? What benefits can be used to motivate individual performance? Discuss other tools that are not related to compensation or ...

Early Childhood Education
An activity center is an area where A. teachers conduct creative activites. B. children participate in active play. C. children and teachers plan the schedule for a day. D. children work on their own with little supervision. I think the answer is D but want to be sure.

Early Childhood Education
The correct definition of the term aesthetics is A.sensing and gaining beauty and wonder from the environment. B. looking at the earth with a utilitarian purpose in mind. I think it's A. Please help

Early Childhood Education
To promote creativity in the classroom curriculum, a teacher should A. follow precise, preplanned steps B. provide materials that allow children to explore. I selected B, am I correct

dressmaking
Sometimes a person's sloping shoulders cause a garment to sag with diagonal wrinkles from the neck end of the shoulder seam to the armhole.To correct this,ripping out the sleeve and then doing which of the following is correct: A)Rip the soulder seam from the center to the...

math (please double check my answers)
x 2 - 4 for x = 5

Algebra II
(7 − 2) ÷ 5=

dressmaking
1)What sewing method should be used to attach a row of two mettalic threads around the wrist of a dress made of voile A)Trapunto B)Fagoting C)Couching D)smocking Im looking at either C or D 2)If you want to attach curved lines of beads,you can either apply each bead singly or ...

physics
For long range communication an elephant uses a low frequency rumble that is undetectable to human ears. One elephant can pick up another elephant's call from a distance of 10 km. The frequency of this rumble is about 13 Hz. How fast does the rumble travel?

physics
For long range communication an elephant uses a low frequency rumble that is undetectable to human ears. One elephant can pick up another elephant's call from a distance of 10 km. The frequency of this rumble is about 13 Hz. How fast does the rumble travel?

chemistry
Thanks and yeah idk those questions are pretty vague but thank you so much anyway!

chemistry
1. When the energy released by the formation of solute-solvent attractions is greater than the energy absorbed by overcoming solute-solute and solvent-solvent attractions, the dissolving process ____. 2. Mixtures are classified according to their ____. 3. A homogeneous mixture...

algebra 2 help please
Actually, you should come out with .89. My teacher told us that it is 1 - 12P7/12^7.

algebra 2 help please
Actually, you should come out with .89. My teacher told us that it is 1 - 12P7/12^7.

algebra 2 help please
0.22

dressmaking
When preparing patterns,the chest measurement is make horizontally at A) the largest part of the bust B) the widest part of the back C) an area under the arm C) an area between shoulderline and bustline I'm thinking it could be either C or D

CALCULUS
Consider the function f(x)=5–4x^2 , -3≤x≤1 The absolute maximum value is __________ and this occurs at x equals ___________ The absolute minimum value is _________ and this occurs at x equals ___________

CALCULUS
The circumference of a sphere was measured to be 83000 cm with a possible error of 050000 cm. Use linear approximation to estimate the maximum error in the calculated surface area. ________________ Estimate the relative error in the calculated surface area. _________________

CALCULUS
The differential of the function y=(x^2+9)^3 is dy=_________ dx. When x=3 and dx=005, the differential dy=_________

CALCULUS
The linearization at a=0 to sqrt(6+6x) is A+Bx where A is:_____ and where B is:_____

Math
Can you help me with the following Input and Output values? Input 0 Output 1 Input 1 Output 10 Input 2 Output 20 Input 3 Output 30 Input 4 Output 40 Input 5 Output 50

chem, predicting direction of change in entropy
Positive

Trig
Find the eccentricity of the ellipse. x^2+7y^2=35

Math
What is the rule if the input number is 32 and the output is 5 input number is 40 and the output is 6 input number is 48 and the output is 7 input number is 56 and the output is 8 input number is 64 and the output is 9

dressmaking
The book says cut 2 bits of fabric on the bias to the desired length and width of the bow and then it tells yu how to make the bow as well as how to make the knot.It doesnt say if yu need to use any extra fabric for the knot only tells yu how to make and attach it to the bow.W...

dressmaking
How many separate pieces of fabric are used to form a bow and knot added as a decoration down the center of a dress A) Two B) Three C) Four D) Five Guessing that the answer could be A or C as fabric has raw edges which needs to be joined together on the wrong side,turned over ...

Calculus
As you know, Chemproc, Inc. is a premier manufacturer of chemicals and chemical waste. Further, as has been recently highlighted on the local news, we are in the process of expanding our Lonlinc, Skanebra chemical manufacturing plant to add two or three new products to our ele...

open collages "pet obedience trainer'
which one of the following statements describes classical conditioning: A. it generally involves more than one independant variable B. it involves the pairing of a conditioned stimulus with an unconditioned stimulus C. it depends on a close relationship between responses and c...

Chemistry!!
Calculate the pH at the equivalence point for the titration of 0.180 M methylamine (CH3NH2) with 0.180 M HCl. The Kb of methylamine is 5.0× 10^–4.

Chemistry
A 0.140-mole quantity of CoCl2 is added to a liter of 1.20 M NH3 solution. What is the concentration of Co^2+ ions at equilibrium? Assume the formation constant of Co(NH3)6^2+ is 5.0× 10^31.

math
that's right

Chemistry
For the first one I put 2NaOH (aq) + Pb(NO3)2 (aq) ==> Pb(OH)2 (s) + 2NaNO3 (aq) and for the second Pb(OH)2 (s) + 2NaOH (aq) ==> Na2Pb(OH)4 (aq) and it keeps saying the second one is wrong. I don't understand what's incorrect.

Chemistry
Write the balanced chemical equation for each of these reactions. Include phases. When aqueous sodium hydroxide is added to a solution containing lead(II) nitrate, a solid precipitate forms. However, when additional aqueous hydroxide is added the precipitate redissolves formin...

sociology 100,social structure
You are walking down the street and in looking around, you can’t help but notice that half or more of the people you see are overweight. How do you explain this observation? Is obesity a personal issue or a societal one? If you were C. Wright Mills, how do you think you w...

Science
Saturated, because you added the salt.

Chemistry
7.8 g of calcium fluoride is dissolved in 100 L of water at 25°C. Will a precipitate be formed?

Chemistry
Calculate the solubility of CaCrO4 if its Ksp is 1.6 x 10-9 at 25°C, in mg/L.Ksp = 1.6 x 10-9

Chemistry
Initially, we place 2 mol of A and 4 mol of B in a 0.5 L flask. At equilibrium, the flask contains 0.3 mol of C. Determine the value of K. A(g) + B(g) <--> 3C(g) + 2D(g)

Chemistry
0.1 mol of HCl is added to 1 L of water. What is [H+] and [OH-]?

Chemistry
A beaker contains 100 mL of water. We add 112 mg of KOH(s). What is the concentration of H+ions?

Chemistry
Which of the following is a condensation reaction? Two monomers combine when one adds to the double bond of another. Two monomers break away when one forms a double bond. Two monomers break away with the addition of a water molecule. Two monomers form a new bond with the loss ...

Chemistry
What is the pH of a solution of 0.1 M silver hydroxide, which is only 10% ionized?

Chemistry
What is the concentration of H+ in a solution containing 73.0 g of HCl in 0.5 L of water?

chemistry
I don't quite under stand that answer..

chemistry
What are [H+] and [OH-] for 0.01 M perchloric acid?

AP Lit and Comp
what is the difference between paradox, juxtaposition, and antithesis?

Physics
A .145kg baseball pitched at 39m/s is hit on a horizontal line drive straight back toward the pitched at 52m/s. If the average force the bat exerts on the ball is 13,200N, how long did the collision last?

Physics
A 2.5kg ball strikes a wall with a velocity of 8.5m/s to the left. The ball bounces off the wall with a velocity of 7.5m/s to the right. If the ball is in contact with the wall for .25s, what is the constant force exerted on the ball by the wall?

Physics
A 55 kg pole vaulter falls from rest from a height of 5m onto a foam rubber pad. The pole vaulter comes to rest .3s after landing on the pad. A) calculate the athlete's velocity just before reaching the pad B) calculate the constant force exerted on the pole vaulter due to...

Physics
a car crashes into a wall at 25m/s and is brought to rest in .1seconds. Calculate the average force exerted on a 75kg test dummy by the seat belt. How many g-forces is this? (Remember g-force= Force/mg)

Physics
A .060kg tennis ball crosses the net a 40m/s and is returned back across the net at 36m/s by the other player. If the contact time between racket and the ball is .0250s, what is the average force on the ball?

Physics
A 50g bullet strikes a stationary 1.50kg block of wood paced on a horizontal surface just in front of the gun. The bullet becomes embedded in the block and the impact drives them a distance of 10m before they come to rest. If the coefficient of kinetic friction between the blo...

Physics
A rocket car had a mass of 1650kg. The engine expels 140kg of combustion products in 7s. The expelled material has a velocity of 850m/s to the south. Calculate the velocity of the car at the end of 7s. ANSWER: 72m/s to the north

Physics
A bullet of mass 35g strikes a stationary wooden block of mass 2.6kg, becomes embedded in the block, and they both move off at 7.5m/s. What was the original velocity of the bullet?

Physics
object A of mass 3g with a velocity of 12cm/s to the east, collides with stationary object B. After collision, object A rebounds with a velocity of 10cm/s to the west and object B has a velocity of 1.5cm/s to the east. Calculate the mass of obeject B

Chemistry
Yes that makes a lot of sense now! Thank you so so much!:)

math-permutuation
a four digit serial number needs to be created using digits 0-9. first digit is even , no digit is repeated , last digit is odd

chemistry
What is the pH of a solution having a hydrogen ion concentration of 1x10^-5 M? Also the same question, but Hydroxide instead of hydrogen. thanks in advance!

Calculus
Approximate the sum of the series correct to four decimal places. n=1 to infinity (-1)^n/4^n*n!

PHYSICS
A tuning fork is set into vibration above a vertical open tube filled with water. The water level is allowed to drop slowly. As it does so, the air in the tube above the water level is heard to resonate with the tuning fork when the distance from the tube opening to the water ...

math
given f(x)=x^3+5x find the rate of change for the interval [0.5,0.51]

Physics
KE1= M1.v1'2/2 KE2= M2V2'2/2 KE1= [(1000kg)(277.89m'2/s'2)/2] = 138944.45J KE2= [(2000kg) (69.3889'2/s'2)/2] = 69388.9J KE1/KE2= 138944.45J/69388.9J =2.00

Physics
KE1= M1.v1'2/2 KE2= M2V2'2/2 KE1= [(1000kg)(277.89m'2/s'2)/2] = 138944.45J KE2= [(2000kg) (69.3889'2/s'2)/2] = 69388.9J KE1/KE2= 138944.45J/69388.9J =2.00

Physics
A king's crown is said to be solid gold but may be made of lead and covered with gold. when it is weighed in air, the scale reads 0.475 kg. when it is submerged in water the scale reads 0.437 kg.is it solid gold? if not, what percent is mass is gold? (density of gold= 19.3...

physics
A scuba diver searches for treasure at a depth of 20.0m below the surface of the sea. at what pressure must the scuba device deliver air to the diver? (density of sea water= 1030kg/m^3;atmospheric pressure= 1.013x10^5 pa)

Calculus
(-1)^1/4^1*1 + (-1)^2/4^2*2 + (-1)^3/4^3*3 + (-1)^4/4^4*4 + (-1)^5/4^5*5 + (-1)^6/4^6*6

Calculus
The answer I got was 0.9336. I did

Calculus
Approximate the sum of the series correct to four decimal places. n=1 to infinity (-1)^n/4^n*n!

psychology
the term "insanity" is used

CHEMISTRY
A 22.2-g piece of Al (which has a molar heat capacity of 24.03 J/mol°C) is heated to 84.6°C and dropped into a calorimeter containing water (the specific heat capacity of water is 4.18 J/g°C) initially at 23.5°C. The final temperature of the water is 27.8°C...

CEMISTRY
Consider a weak acid HX. If a 0.10 M solution of HX has a pH of 5.87 at 25°C, what is ΔG° for the acid's dissociation reaction at 25°C?

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