Monday

May 2, 2016
Total # Posts: 3,210

**Calculus**

h(x)= x + cos(ax), where a is a positive constant such that 0 < a < 4. For what values of a will h(x) have a relative maximum at x=1? So I found the derivative and got h'(x) = 1- asin(ax). Then I plugged in 1 for x and set the derivative equal to zero, so I have 1 - ...
*May 1, 2015*

**Algebra**

The following equation is quadratic. f(x)=(x-7)(3x-2) What are the x-intercepts of the graph of the related equation y=(x-7)(3x+2)? A) -7 and 2/3 B) -7 and 3/2 C) -3/2 and 7 D) -2/3 and 7
*April 30, 2015*

**Calculus**

I'm not sure how to do this; I figured I should use separation of variables but I got the wrong equation. Help is appreciated, thanks! If dy/dx=(1+x)/(xy), x > 0, and y = –4 when x =1, when x =3, y = ? A. 6.433, −6.233 B. 3.898, −3.898 C. 4.711, −...
*April 30, 2015*

**Calculus-limits**

What is the limit as x approaches a of (sinx-sin a)/(x-a)? a. -sin a b. cos a c. -sin x d. cos x e. undefined Thanks!
*April 29, 2015*

**Calculus-limits**

I'm studying for the AP exam and I can't figure this problem out. I thought the answer was negative infinity but that isn't an option. Thank you in advance! What is the limit as x approaches infinity of (9x-x^2-7x^4)/(x^3+12x)? a. 9 b. 7 c. -7/12 d. -7 e. Does not ...
*April 29, 2015*

**Chemistry**

Sulfur trioxide decomposes into sulfur dioxide and oxygen in an equilibrium. You have a 3.00 L vessel that is charged with 0.755 mol of SO3. At equilibrium, the amount of SO3 is 0.250 mol. 2 SO3 (g) ----> 2 SO2 (g) +O2 (g) A) calculate the equilibrium concentrations of SO2 ...
*April 28, 2015*

**algebra**

The apartment building where Herman lives was built 12 years before his grandmother's house. In 4 years, the apartment building will be twice as many years old as Herman's grandmother's house. How many years ago was Herman's grandmother's house built?
*April 28, 2015*

**Calculus**

Can someone check my work on this problem? I'm studying for the AP test and I would really appreciate any help. Let f(x) = the definite integral from [-2,(x^2-3x)] of e^(t^2) dt At what value of x is f(x) a minimum? a. For no value of x b. 1/2 c. 3/2 d. 2 e. 3 The answer I...
*April 28, 2015*

**Calculus help??**

I'm not sure how to solve this and help would be great! d/dx [definite integral from 0 to x of (2pi*u) du] is: a. 0 b. 1/2pi sin x c. sin(2pi x) d. cos (2pi x) e. 2pi cos (2pi x) This is the fundamental theorem, right? What's confusing me is the u and du and the end. ...
*April 28, 2015*

**Algebra**

Jack bought 3 slices of cheese pizza and 4 slices of mushroom pizza for a total cost of $12.50. Grace bought 3 slices of cheese pizza and 2 slices of mushroom pizza for a total cost of $8.50. What is the cost of one slice of mushroom pizza?
*April 27, 2015*

**Physics**

Two pellets, each with a charge of 1 microcoulomb, are located 3 cm apart. What is the electric force between them?
*April 27, 2015*

**Physics**

An equal amount of heat is transferred to two containers containing water at the same temperature. If the second container contains three times as many water molecules as the first, how do the final temperatures compare?
*April 27, 2015*

**Calculus**

The expression dy/dx = x*(cube root y) gives the slope at any point of the graph of the function f(x) where f(2) = 8. A. Write the equation of the tangent line to f(x) and any point (2,8). B. Write an expression for f(x) in terms of x. C. What is the domain of f(x)? D. What is...
*April 26, 2015*

**math **

If the intensity of a lightbulb is 45w/m^2 at a distance of 8m, then what is the intensity of it at a distance of 3m?
*April 26, 2015*

**Chemistry**

Consider the following reaction: CO(g)+2H2(g)⇌CH3OH(g) Kp=2.26×104 at 25 ∘C. Calculate ΔGrxn for the reaction at 25 ∘C under each of the following conditions. A) Standard Conditions B) at equilibrium C)PCH3OH= 1.3atm ; PCO=PH2= 1.2×10−2atm
*April 22, 2015*

**Chemistry**

Consider the following reaction: 2NO(g)+O2(g)→2NO2(g) Estimate ΔG∘ for this reaction at each of the following temperatures and predict whether or not the reaction will be spontaneous. (Assume that ΔH∘ and ΔS∘ do not change too much within...
*April 22, 2015*

**Math**

A toy company has increased their size of one of their dolls. The packaging department has calculated that they need to add 3 inches to each of the dimension of the original packaging (Original height=10 in width=2.75 length=5). What is the new amount of material needed to ...
*April 20, 2015*

**s.s**

power to make laws
*April 17, 2015*

**s.s**

I thing it supreme court
*April 17, 2015*

**s.s**

the legislative branch of the federal government made up of the (Congress/Supreme court)
*April 17, 2015*

**s.s**

is it d
*April 17, 2015*

**s.s**

is it a
*April 17, 2015*

**s.s**

what were the two main goals of the constitution's creators? a.create local goverments and elect a president b.establish the 51st state and define borders c. raise taxes to build the treasury and pay off war debts d. protect citizens' rights and defend the country
*April 17, 2015*

**Integration by Parts**

integral from 0 to 2pi of isin(t)e^(it)dt. I know my answer should be -pi. **I pull i out because it is a constant. My work: let u=e^(it) du=ie^(it)dt dv=sin(t) v=-cos(t) i integral sin(t)e^(it)dt= -e^(it)cos(t)+i*integral cost(t)e^(it)dt do integration by parts again, then I ...
*April 16, 2015*

**business math**

626,863.20$
*April 12, 2015*

**Calculus**

Oil spilled from a ruptured tanker spreads in a circle whose area increases at a constant rate of 7.5 mi^2/hr. How rapidly is radius of the spill increasing when the area is 8 mi^2? I tried using A=(pi)r^2 and dA/dt=2(pi)r(dr/dt) and plugging in 7.5=2(pi)8(dr/dt) but the ...
*April 10, 2015*

**math**

So it is A?
*April 9, 2015*

**math**

Students in Mrs. Doyles classes use 3/4 of a bottle of hand sanitizer every week. Which expression can be used to find how many bottles of hand sanitizer the students will use in 12 weeks. A. 12 x 3/4 B. 12 + 3/4 C. 12 - 3/4 D. 12 divided by 3/4 I have narrowed it down to A ...
*April 9, 2015*

**Math**

yes
*April 8, 2015*

**math**

an oatmeal cookie recipe that makes 24 cookies requires 1 cup of sugar if alex needs 30 cookies how many cups of sugar should she use
*April 7, 2015*

**math**

Juanita Finn deposits $12,000 into an account at Valley Bank that pays 8% interest compounded quarterly. At the end of 5 years, how much will Juanita have in her account? Round to the nearest cent.
*April 7, 2015*

**LA/READING(:**

1. B 2. A 3. A 4. B 5. A 6. Essay 7. D 8. B 9. D 10. B 11. C 12. D 13. B 14. C 15. D 16. A 17. C 18. A 19. B
*April 6, 2015*

**LA/READING(:**

Hailey is Linda correct on hers?
*April 6, 2015*

**chemistry**

25 mL 0.4 M KOH will neutralize 10 mL 1.0 M H2SO4 solution. A) True B) False
*March 27, 2015*

**History**

US History Crossword Puzzle 1. 9 letters; areas of Mississippi and Alabama characterized by black soil and excellent cotton-growing conditions 2. 13 letters; cotton-producing region of the southern United States How did the Free-Soil Party propose to handle of the question of ...
*March 25, 2015*

**Math**

Use the initial condition y(0)=4 and step size h=.25, calculate the backward Euler on [0,1] for the ODE y'=10y-10y^2. Solve the ODE exactly and compute the errors at t=1.
*March 25, 2015*

**math**

How to make pyramid pattern of 140 blocks?
*March 24, 2015*

**Math**

How much more would there be at the end of 8 years if $4000 were invested at 14% compounded quarterly rather than semiannually? (Round your answer to the nearest cent.)
*March 22, 2015*

**Career Explorations**

career experience
*March 18, 2015*

**7th grade math**

Can u help me ?
*March 18, 2015*

**7th grade math**

For questions 1, 2 identify each sentence as arithmetic, geometric both or neither. 1) 7, 9, 11, 13 ...... A) arithmetic B) geometric C) both D) neither (my answer) 2) 2, 1, 1/2, 1/4, .... A) arithmetic B) geometric C) both (my answer) D) neither
*March 18, 2015*

**accounting**

Savallas Company is highly automated and uses computers to control manufacturing operations. The company uses a job-order costing system and applies manufacturing overhead cost to products on the basis of computer-hours. The following estimates were used in preparing the ...
*March 10, 2015*

**statistics**

A jar contains 3 nickels and 2 dimes. You reach in and randomly select 2 coins. Let x represent the value of the two coins in cents. Find the expected value and standard deviation of x
*March 10, 2015*

**LANUGAGE ARTS**

idk
*March 6, 2015*

**Math**

Thank you so much!
*March 5, 2015*

**Math**

When dropped on a hard surface, a rubber ball takes a series of bounces, each one about 4/5 as high as the preceding one. If the rubber ball is dropped from a height of 20 ft, what is the approximate distance the ball travels before coming to rest? Please explain how you got ...
*March 5, 2015*

**Art**

1.d 2.a 3.d 4.b 5.b
*March 2, 2015*

**Physics**

A 7.5 kg box is on a table. What is the normal force acting on the box in each of the following situations? a) You leave the box alone. b) You push down on the box with a force if 20 N. c) You pull up on the box with a force of 20 N.
*March 1, 2015*

**Physics**

A worker pushes horizontally on a 25 kg crate resting on ground level. The coefficients of static and kinetic friction are 0.4 and 0.3.? a) How much force must he apply to start the crate moving? b) After the crate has stereo moving, how much force must he apply to move the ...
*March 1, 2015*

**Geometrt**

Casey sights the top of an 84 foot tall lighthouse at an angle of elevation of 58 degrees. If casey is 6 feet tall, how far is he standing from the base of the lighthouse?........ Do I use cos, tan, or sin? I did the rest of the worksheet but I'm not sure for this one
*February 28, 2015*

**Physics**

Label as to Mechanical, Electrical, Chemical, Heat, Radiant, Nuclear energy: 1) an egg 2)fire 3)waterfall 4)sound 5)light 6)gasoline 7)lightning 8) sun's energy 9) cooking an egg
*February 26, 2015*

**math**

Jennifer Rick went to Sunshine Bank to borrow $3,500 at a rate of 10¾%. The date of the loan was September 7. Jennifer hoped to repay the loan on January 15. Assume the loan is calculated using ordinary interest. How much will Jennifer totally repay?
*February 26, 2015*

**science**

What will happen when I put in minty mentos into all different kinds of soda?
*February 25, 2015*

**math**

I would say 5,240
*February 25, 2015*

**math**

If √6 is the geometric mean between 6 and another number, then the number is: 1 2 6
*February 25, 2015*

**Math**

Find the equation of the line that passes through (-5,4) and (6,4) My work: M= 4-4/6+5 = 0/11 y=mx+b 4= 0(6) + b 4=b Y=4 Therefore, the equation of the line that passes through (-5,4) And (6,4) is y=4 Was this done correctly?
*February 19, 2015*

**Math**

In a piggy bank there is a total of $15.75. If the ratio of dimes to quarters is 5:7, find the total amount in quarters.
*February 19, 2015*

**chemistry**

I have a lab finished and I have to find the dehydrated sample (show calculations) and the value of n (show calculations). I just need to know how I go about finding these answers using my data?
*February 19, 2015*

**chemistry**

Epsom salts is magnesium sulfate heptahydrate. If a student takes 2.50 g of Epsom salts and heats it to drive off the water, how much mass should the student expect to lose? ( I know that hepta is 7 but that's still not making sense to me)
*February 19, 2015*

**Physics**

An 17.2 kg box is released on a 35.7° incline and accelerates down the incline at 0.274 m/s2. Find the friction force impeding its motion. (in N) How large is the coefficient of friction?
*February 10, 2015*

**Physics**

A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.210 and the push imparts an initial speed of 3.50 m/s? (in m)
*February 10, 2015*

**Physics**

If the coefficient of kinetic friction between a 32.7 kg crate and the floor is 0.295, what horizontal force is required to move the crate at a steady speed across the floor? (in N) What horizontal force is required if Uk is zero? (in N)
*February 10, 2015*

**Math**

Find the distance between P1(3, –195°) and P2(–4, –94°) on the polar plane. Round your answer to the nearest thousandth. I got 5.75 as my answer. Is this correct?
*February 6, 2015*

**math estimating products**

Show three ways to estimate 3 / 5 ×9 1/2. Identify each method you use.
*February 5, 2015*

**Science**

What is the central theme of the “As Cheap as Coal” portion in Section 8.1 of your text? (Points : 1)
*January 30, 2015*

**chemistry**

What is the molar mass of pentane if 4.18 ~ 1016 molecules of pentane weigh 5.00 ƒÊg?
*January 30, 2015*

**Science**

i don't know i'm on the same question but i have no clue
*January 28, 2015*

**Math**

So...I would take 1 billion * 6.14in then divide by25,000 to get my answer right?
*January 27, 2015*

**Math**

SIZE: US currency bills are are 2.61 inches wide and 6.14 inches long; they are .0043 inches thick and weigh 1 gram.
*January 27, 2015*

**Math**

Needing help setting these problems up...not necesarily giving me the answers. thanks. In January 2009 the state of Nevada was facing a budget deficit of $1.5 billion. The population of the state was approximately 2 million. How much would each person in the state have to ...
*January 27, 2015*

**Math word problems**

thats the way i ended up doing it...thanks.
*January 27, 2015*

**Math word problems**

An outdoor supply store has its regularly priced $160 jackets on sale for $120. What is the discount rate? 120/160*100=75% but that doesn't seem right. I believe it should be 25% discount, but I dont know how to set that up. Can someone tell me if the above is correct, if ...
*January 27, 2015*

**Math**

Alexander Smith receives a salary of $250 per week plus a commission of 15% on all sales over $1500. Find his earnings during a week in which sales totaled $3000. Not sure how to set this up.
*January 26, 2015*

**French**

Thank you both!
*January 23, 2015*

**French**

Can you look over my french paragraph and make sure it's grammatically correct? Thank you in advance! Mon manoir est grand. Le toit est plat. Cette maison a deux etages. Ma chambre est en bas. Il y a sept chambres dans la maison. Ma chambre est confortable et moderne.
*January 23, 2015*

**Geometry **

ABC= (5x+40) and BDC=ax what is the value of x
*January 19, 2015*

**history**

Colorado
*January 14, 2015*

**math**

I have to find the unit rate 3\5 divided by 3\8 and ui can't figure out how you would get 3\8 to one?
*January 14, 2015*

**Agricultural,maths Literacy,business studies and Geography**

I'm not sure yet
*January 14, 2015*

**phys**

While spinning in a centrifuge, a 70.0 kg astronaut experiences an acceleration of 5.00 g, or five times the acceleration due to gravity on the earth. What is the centripetal force acting on her?
*December 21, 2014*

**math**

Ralph packs 9 three-fourth pound sacks of candy in each carton. How many pounds of candy is that?
*December 10, 2014*

**Social studies**

Why were the Greek city-states open to an attack by Philip I of of Macedonia?
*December 7, 2014*

**7th grade science**

the answer was b
*December 4, 2014*

**7th grade science **

some animals, but not humans have an organ called a gizzard located near the top of their digestive tract. this organ is small and can contain small rocks. it also has thick muscular walls. based on this physical description which of the following is most likely to be the ...
*December 4, 2014*

**5th grade math**

first take the decimal away and round for example lets say your decimal is 6.54 take away the decimal 654 now use the second number which in this case is 5 to round 6 to 7 to get 700 now add the decimal back in so you will have 7.00 same with dividing lets say you have 5.00 ...
*December 4, 2014*

**6th grade Math**

483 divided by 11.50 42 hours
*December 3, 2014*

**stats**

Variance=25 Std Deviation = 5 so 1.5 = (5/sqrt(n) n=11.11 then round up and n=12
*December 3, 2014*

**Math Proof**

prove f(x)=b^x is continuous on (-infinity,infinity) i.s at all a exist in reals. here assume b does not equal 1, but b>0
*December 1, 2014*

**reading**

From this paragraph, what relationship can you infer between the jogger and the writer? A. The writer is observing a typical jogger. B. The writer is in danger from the jogger. C. They are complete strangers to each other. D. They are well known to each other.
*November 20, 2014*

**Algebra, help please!!!**

Subtract 66-21? Is it a good measure of spread as well then?
*November 19, 2014*

**Algebra, help please!!!**

The youngest person in the company is 21. The oldest is 66. A: What is the range? B: Is the range a good measure of spread for the ages in the company? Why?
*November 19, 2014*

**Algebra, help please!!!**

Find the mean and the median in the following arithmetic sequences: A: 1, 3, 5, 7, 9 B: 1, 3, 5, 7, 9, . . . ., 199 C: 7, 10, 13, 16, . . ., 607
*November 19, 2014*

**MATH!!!**

Al saves pennies. He agreed to give 5/11 of his pennies to bev . If she would give 5/11 of what she got from al to carl and in return if he would give 5/11 of what he got from bev to danni, carl and agreed and danni recived 750 pennies . How many pennies did al have?
*November 19, 2014*

**Phil**

Identify the premise/s and the conclusion and label them. Complete the argument if necessary. 1.My bowl fell off of the counter and broke. If your bowl falls off of the counter, it will break. 2.You shouldn’t be so critical of War and Peace. You’ve never read it. 3....
*November 18, 2014*

**spanish**

what is 1+1
*November 18, 2014*

**Probability.. HELP!**

At the American Kennel Club, there are 36 dogs entered in a show where there will be a first-, second-, and third- place award. How many possibilities are there for these awards?
*November 13, 2014*

**Math, Please Help!**

I got 144 for TENNESSEE (9*1*2*4*2) and I got 16 for OHIO (4*2*2). I don't understand how you got your numbers and if I am doing this wrong?
*November 13, 2014*

**Math, Please Help!**

I don't understand how you got them? I have tried to figure this out and can't get the right answer on how you got your answers.
*November 13, 2014*

**Math, Please Help!**

Find the number of ways to arrange the letters in the following words: A: Ohio B: Alabama C: Illinois D: Mississippi E: Tennessee
*November 13, 2014*

**Math, Please Help!**

Suppose a dot is placed at random in a 10 x 10 graph grid in which squares have been numbered from 1 to 100 with no number repeated. Now simulate choosing 100 numbers at random between 1 and 100 inclusive. How many numbers might you expect to match the square with the dot?
*November 12, 2014*