# Posts by cynthia

Total # Posts: 593

**math**

jordan has a bag that contains 246 marbles. there are 51 brown marbles and 195 gray marbles. estimate the percent of the brown marblesin the bag.

**physics**

What is k in the formula (3/2)kT

**physics**

What is k in the formula (3/2)kT

**physics**

What is k in the formula (3/2)kT

**Please HELP with this storie problem**

use a matrix

**Algebra 2**

thankss (:

**Algebra 2**

Simplify. (2-5i)-(3+4i)

**Algebra 2**

omg thank you soooo much (:

**Algebra 2**

thank you do you know how to do it though?

**Algebra 2**

The numbers iã5 and -iã5 are solutions to which equation? a. x^2+ã5=0 b. x^2+5=0 d. x^2-5=0

**english**

Can some check this for me thanks

**english**

1. A 2. B 3. D 4. D

**english**

1.Identify the reason for the comma(s) in the following sentence: When you have the opportunity to interview for a job, you can improve your chances for consideration by dressing for success. a.To join two independent clauses (along with a conjunction) b.To separate an ...

**Math**

Find the equation of the line that passes through the pair of points. Write your answer in slope-intercept form (2,-5)(2,-1)

**chemistry**

0.0386mol glucose in 88.0ml of solution

**Psychology**

How does biological and environmental factors shape our cognitive processes?

**Psychology**

How does one's cognitive processes shape some aspects of personality?

**Finance**

You own a portfolio that has $1500 invested in Stock A and $2,600 invested in Stock B. If the expected returns on these stocks are 11.1 percent and 16.7 percent, respectively, what is the expected return on the portfolio?

**math**

bill and ted combined age is 40. Eight years ago, bill was 2 years younger than ted is now. how old is bill now?

**Calculus**

1. Locate the absolute extrema of the function f(x)=cos(pi*x) on the closed interval [0,1/2]. 2. Determine whether Rolle's Theorem applied to the function f(x)=x^2+6x+8 on the closed interval[-4,-2]. If Rolle's Theorem can be applied, find all values of c in the open ...

**grammar - sentence structure**

I was wondering if you could tell me if my sentence structure using ":" and quotations is correct... Furthermore, when Howard states: “If I had a spot, I'd slap you in” (54:14), and “everybody has to pull his own weight” (54:30), he uses the ...

**Precalculus**

A barn has 150 feet of fencing and there are 3 rectangular corrals of identical dimensions along the back wall of the barn. The sides of each corral are attached to the barn and fencing is not needed along the back wall of the barn. If each corral is 30 ft. long (front to back...

**Precalculus**

A barn has 150 feet of fencing and there are 3 rectangular corrals of identical dimensions along the back wall of the barn. The sides of each corral are attached to the barn and fencing is not needed along the back wall of the barn. If each corral is 30 ft. long (front to back...

**geometry**

what is the base length of a paralleogram whose area is 52 m squared and whose height is half is based lenghth

**Physics**

Trying to be on time for class, a girl moves at 2.4 m/s down a 52 m-long hallway, 1.2 m/s down a much more crowded hallway that is 79 m long, and the last 25 m to her class at 3.4 m/s. How long does it take her to reach her class?

**simplify expression.**

|7|+|-14|

**math**

81 boys and 81 girls

**chemistry**

_mg(OH)†? + _H2SO4._mgSO4 + _H2O

**Trigonometry**

Find the exact value of tan2(Beta) if sin(Beta) = 5/13 (Beta in Quadrant II)

**Trigonometry**

Write 2sin37(degrees)sin26(Degrees) as a sum (or difference)

**Calculus**

Find the centroid of the area bounded by the parabola y = 4 - x^2 and the x-axis. A. (0,1.6) B. (0,1.7) C. (0,1.8) D. (0,1.9) Find the average value of the function i=15(1-3^-1/2t) from t=0 to t=4. A. 7.5(1+e^-2) B. 7.5(2+e^-2) C. 7.5(2-e^-2) D. 7.5(3-e^-2)

**Calculus**

evaluate (integral) xe^2x dx A. 1/6x^2 e^3x+C B. 1/2xe^2x-1/2e^2x+C C. 1/2xe^2x-1/4e^2x+C D. 1/2x^2-1/8e^4x+C Evaluate (integral) e^3x cosh 2x dx A. 1/2e^5x + 1/2e^x +C B. 1/10e^5x + 1/2e^x + C C. 1/4e^3x + 1/2x + C D. 1/10e^5x + 1/5x + C

**Calculus**

to evaluate (integral) 3x^2 cos (2x^3-4) dx, it is necessary to let A. u=3x^2 B. u=6x C. u=2x^3-4 D. u=6x^2

**Calculus**

Which of the following is a step in evaluating. (Integral) cos^2 5x dx A. (Integral) 1+cos10x/2 dx B. (Integral) 1-cos10x/2 dx C. (Integral) 1+cos10x/20 dx D. (Integral) 1-cos10x/20 dx

**Calculus**

Evaluate (integral) e^3x dx. A. e^3x + C B. 1/3e^3x + C C. e^4x + C D. 1/4e^4x + C

**Calculus**

Evaluate (Integral) sin 4x cos^2 4x dx. A. Cos^3(4x)/3 + C B. -Cos^3(4x)/3 + C C. Cos^3(4x)/12 + C D. -Cos^3(4x)/12 + C

**Calculus**

Evaluate (integral) cot 2x dx. A. 1/2Ln sin 2x+C B. 1/2Ln cos 2x+C C. 1/2Ln sec 2x+C D. 1/2LN csc 2x+C

**science**

how does the musculoskeletal system change from birth to adulthood to achieve 206 bones?

**Trigonometry**

Write 2sin37(degrees)sin26(Degrees) as a sum (or difference)

**Trigonometry**

Prove that tan (Beta) sin (Beta) + cos (Beta) = sec (Beta) Please explain.

**Trigonometry**

Prove that tan^2(alpha)-1+cos^2(alpha)sin^2(alpha) Please Explain

**Trigonometry**

* Solve tan^2x + tanx-1=0 for the principal value(s) to two decimal places.

**Trigonometry**

Solve tan2 x + tan x – 1 = 0 for the principal value(s) to two decimal places. Please Explain

**Trigonometry**

Solve cos 2x – 3sin x cos 2x = 0 for the principal value(s) to two decimal places. Please explain.

**algebra**

find the total number of feet of wood needed if the trellis is 8 feet tall and 2 feet wide.

**math**

How to find the reciprocal of 5/3?

**math**

How do you find the reciprocal of 5/3

**psychology 240**

Factors that Determine What, When, and How Much We Eat, in the text, does your personal experience support these concepts? Why or why not? Provide examples

**language**

What's the noun and verb in seek his will in all you do and he will direct your path.

**chemistry**

A weather balloon if it starts with 10 liters of helium at 0km elevation and a temperature of 20 degrees. it is released and rises up through the atmosphere to an elevation of 12km where the temperature is -60degrees. calculate the volume of the helium at 12km.

**Calculus**

Use the given equation to answer the following questions. (Enter your answers from smallest to largest.) r = 8cos(¦È) 0 ¡Ü ¦È < ¦Ð (a) Find the points on the given curve where the tangent line is horizontal. theta= theta= (b...

**Math**

Carole earns 2.50 for each gadget she completes, what was her gross pay if she completed 145 gadgets last week.

**Pre calculus**

How do you work this problem? Find the exact value of sin 2u, cos 2u, and tan 2u given that cot u=3 and 180<u<270

**health**

Which age groups benefit from physical activity? A. Children B. Middle aged adults C. Older adults D. All of the above

**MATH**

What percentage of scores falls between +1 and +2 standard deviations?

**health**

What is a medical scientist,if you want to study medical science,what are the minimum requirements?and how can you briefly describe medical science?

**Physics**

A box rests on the back of a truck. The coefficient of static friction between box and bed of the truck is 0.255. (a) When the truck accelerates forward, what force accelerates the box? A)the inertial force B)gravity C)centripetal force D)the friction force (b) Find the ...

**Physics**

A fire helicopter carries a 520-kg bucket of water at the end of a 20.0-m long cable. Flying back from a fire at a constant speed of 40.0 m/s, the cable makes an angle of 38.0° with respect to the vertical. Determine the force exerted by air resistance on the bucket.

**Chemistry**

A student titrated 1.852 g of a mixture containing potassium hydrogen phthalate, KHP....? A student titrated 1.852 g of a mixture containing potassium hydrogen phthalate, KHP, with 0.163 M NaOH solution. She recorded an initial buret reading of 0.84 mL and a final buret ...

**Chemistry**

Determine the molarity of a sodium hydroxide solution? if 37.34 mL of it are required to neutralize 1.922 g of citric acid. balanced equation- 3NaOH(aq)+H3C6H5O7-->3H2O(l)+NaC6H5O7(aq… ***Plesae show steps.

**Life orientation RAPHELA**

ICASA AKA INDEPENDENT COMMUNICATION AUTHORITY OF SOUTH AFRICA

**Life orientation**

Explain three checks and balances that are in place in south africa that control and regulate the media

**Chemistry**

Zn metal was allowed to react with hydrochloric acid to produce hyrdogen gas.This gave a total of 555mL of gas collected over water at 20C and a pressure of 747mm of Hg. How many moles of hydrogen were collected? The vapor pressure of water at 20C is 18mm Hg.

**Chemistry**

How many liters of hydrogen gas can be made from 65.5g of magnesium at STP? Magnesium reacts to sulfric acid according to this equation... Mg+H2SO4-->MgSO4+H2

**Chemistry**

Using the van der Waals equation, determine the pressure of 436.0g of SO2(g) in a 7.30-L vessel at 725k.? For SO2(g), a=6.865L^2•atm/mol^2 and b=0.05679L/mol. (R=0.0821L•atm/(K•mol))

**Chemistry**

What how can I calculate the amount in moles and the mass in grams of KOH needed to convert 1.50 g of aluminum to KAl(OH)4. Balanced equation = 2 Al (s) + 2 KOH (aq) + 6 H2O (l)->2 KAl(OH)4 (aq) + 3 H2 (g) Please show steps ..

**Chemistry**

If the percent yield was 81.5%, how many grams of aluminum were used to prepare 20.0 g of potassium alum?

**Chemistry**

Calculate the percent yield of alum if you obtained 75.0 g of potassium alum from 5.00 g Al.

**Chemistry**

How many moles and how many grams of potassium alum, KAl(SO4)2 · 12 H2O, can be prepared from 5.00 g of aluminum?

**Chemistry**

Which one ?

**Chemistry**

Calculate the amount in moles and the mass in grams of KOH needed to convert 1.50 g of aluminum to KAl(OH)4. Balanced equation = 2 Al (s) + 2 KOH (aq) + 6 H2O (l)->2 KAl(OH)4 (aq) + 3 H2 (g)

**Chemistry**

Calculate the volume (in mL) of 9.0M H2SO4 that you would need to convert 0.070 moles of KAl(OH)4 to K2SO4 and Al2(SO4)3 according to the following equation: 2 KAl(OH)4 + 4 H2SO4->K2SO4 + Al2(SO4)3 + 8 H2O

**Chemistry**

Calculate the amount in moles and the mass in grams of KOH needed to convert 1.50 g of aluminum to KAl(OH)4. Balanced equation = 2 Al (s) + 2 KOH (aq) + 6 H2O (l) ¨ 2 KAl(OH)4 (aq) + 3 H2 (g)

**Calculus AP need help!**

oops.. i thought 1/2 to -3/2. now i understand. thanks

**Calculus AP need help!**

1. f(x)=√5x+6, find f'(x) 2. f(x)=√4x^2+3x+4, find f'(x). i got stuck. f(x)=√5x+6=(5x+6)^1/2 f'(x)= 1/2(5x+6)^-3/2*(5).

**algebra. help!!**

my answer is 63.56. i don't know if its right answer. here this problem: It takes Scott an average of 45 min to prune 1 tree. Victor takes 65 min to prune a tree on average. The Scott-Victor Pruning Service has the contract to prune 92 trees in Flagstaﬀ, AZ. How ...

**COLLEGE CALCULUS. HELP!**

Find the derivative of the function. 1. F(x)= (1+2x+x^3)^1/4 2. f(t)= (1+tant)^1/3

**COLLEGE CALCULUS. HELP!**

i got it thanks

**COLLEGE CALCULUS. HELP!**

hey how u get 324x?

**COLLEGE CALCULUS. HELP!**

i got stuck

**COLLEGE CALCULUS. HELP!**

Let f(x)=(-3x^2+6)^4(9x^2+7)^14, Find f'(x). f'(x)= (-3^2+6)^4 d/dx(9x^2+7)^14+(9x^2+7) d/dx(-3x^2+6)^4 =(-3x^2+6)x14(9x^2+7)^13 d/dx(9x^2+7)+(9x^2+7)^14x4(-3x^2+6)^3 d/dx(-3x^2+6) =14(-3x+6)^4(9x^+7)^13 (18x)+ 4(9x^2+7)(-3x^2+6)^3 (-6x)

**Chemistry**

The concentration of Pb+2 in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of the wastewater is added an excess of sodium carbonate, forming the insoluable lead(II)carbonate (267.2092 g/mol) according to the balanced equation ...

**Chemistry**

In basic solution, H2O2 oxidizes Cr+3 to Cro4^-2 and is reduced to OH-. What is the balanced equation?

**Chemistry**

What mass of oxalic acid dihydrate , H2C2O4•2H2O, is required to prepare 220.0 ml of a 1.28 M solution of oxalic acid ?

**Chemistry**

A student must prepare 2.00 L of 0.100 M Na2CO3 (106 g/mol) Which is the best procedure for preparing this solution ?

**Chemistry**

A 30.00-mL sample of weak acid is titrated with 0.0167 M NaOH. At the endpoint , it is found the 40.35 mL of titrant was used. What was the concentration of the weak acid ?

**Chemistry**

A student must prepare 2.00 L of 0.100 M Na2CO3 (106 g/mol) Which is the besst procedure for preparing this solution ?

**Chemistry**

How many grames of lithium nitrate LiNO3 (68.9 g/mol) are required to prepare 174.1 mL of a 0.698 MLiNO3 solution ?

**Chemistry**

What is the net ionic equation for the reaction that occures between nitrouse acid and strontium hydroxide ?

**Chemistry**

What is the net ionic equation for the reaction that occures between nitrouse acid and strontiun hydroxide ?

**Project Management**

What elements do you think are critical when conducting project meetings and why do you think they are important? How do project meetings help with managing inter-organizational relations? Be sure to address the concept of group think in your discussion.

**Business**

Select an organization with which you are familiar and discuss the impact of that organization’s level of social responsibility on a stakeholder group of your choice

**Business**

Select an organization with which you are familiar and discuss the impact of that organization’s level of social responsibility on a stakeholder group of your choice

**Chemistry**

A lightyear is a unit of length equal to the distance that light travels in 1 year. What is 1 lightyear expressed in units of meters? The speed of light is 3.00 × 100^8 m/s.

**Chemistry**

Could you explain how or why ?

**Chemistry**

The enthalpy of combustion of benzoic acid is –26.4 kJ/g. What is the enthalpy of combustion expressed in joules per kilogram?

**chemistry**

How many 400-mg aspirin tablets can be made from 40.0-kg of aspirin?

**scientific notations**

7.13x10^11 = 713,000,000,000 - To convert from scientific notation to standard from simply move the decimal point 11 spaces to the right after the 7 . 10's power will tell you how many spaces to move to decimal , if its positive to the right and if its negitave to the left...

**Medical Coding**

what are the 2 diagnosis codes

**Statistics**

are the following statements, Ho:=10 and Ha:equal to or less than, a valid pair of null and alternative hypothesis?assume that in a hypothesis test with null hypothesis Ho : u = 12.0 at a = 0.10, that a value of 16.0 for the sample mean results in the null hypothesis being ...