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Posts by James

Total # Posts: 2,491

Calculus - Special sum formulas
Find a formula for Sum_{j=1}^n (j+3) (j-4) So far, I have foiled to j^2-j-12. Thus,Sum_{j=1}^n(j^2) - Sum_{j=1}^n(j) - Sum_{j=1}^n(12). From Special Sum formulas, I have gotten to n(n+1)(2n+1)/6 - n(n+1)/2 - 12n What do I do from here?

Calculus - Differential Equations
Use separation of variables to find the solution to the differential equation: 4 (du/dt) = u^2, subject to the initial condition u(0)=6.

Calculus
Find the xy-equation of the curve that passes through (-2, -2) and whose slope at any point on the curve is equal to 5 times the x-coordinate of that point

Calc
A rectangular package to be sent by a postal service can have a maximum combined length and girth (perimeter of a cross section) of 90 inches (see figure). Find the dimensions of the package of maximum volume that can be sent. (Assume the cross section is square.)

Calculus
True or False If F(x) and G(x) are antiderivatives of f(x), then F(x)=G(x)+C If f'(x) = g(x) then integral g(x) dx = f(x) + C Integral f(x) * g(x)dx = integral f(x)dx * integral g(x)dx I have a feeling it's False True True

Math
Kate cycles the first 350 km of a 470 km journey at a certain average speed and the remaining distance at an average speed that is 15 km/h less than that for the first part of the journey. If the time taken for her to travel each part of her journey is the same, find the ...

Calc
If a car is driving in a straight line with constant acceleration a, initial velocity v0, and initial position s0, find a formula for the position function of the car. How would I solve this equation?

chemistry
what is the name of this coordination compound [CoSO4(NH3)5]Br?

Math
Ten analog measurements whose bandwidth is 4 kHz are to be transmitted simultaneously through a cable by time division multiplexing using PCM. Each message is sampled at a 10 kHz rate and amplitude quantized into 128 levels. The pulses are shaped with a near-ideal low pass ...

Math
We are given the problem of communicating a series of symbols, each of which can take on one of 512 values at a rate of f_s =〖10〗^5 symbols/s. A) What is the required bandwidth if PCM is used with m=1? B) Repeat for PAM with m=2, if each pulse can take on 8 ...

Math
A sausage sample was found to contain 65% moisture, based on fresh weight. The sausage was dried in an oven until its moisture content was 10%. A 2.0 g portion of the dried sausage was extracted with the Soxhlet method to determine the amount of crude fat. A clean Soxhlet ...

History
Thanks Ms.sue

History
How did George Mason influence the creation of Bill of Rights? A.He refused to sign the United States Constitution. B.He encouraged others to opposed the ratification of the Constitution. C.He assembled a anti-federalist convention in Virginia to discuss the matter. D.He wrote...

chemistry
0.350 L of 0.470 M H2SO4 is mixed with 0.300 L of 0.250 M KOH. What concentration of sulfuric acid remains after neutralization?

Maths
A plane flies a course of 346 degrees and then turns through 30 degrees in the clockwise direction. Find its new bearing. Since the plane from starting point covers a bearing of 346 degrees it's now going to be in the NW direction but going 30 more degrees clockwise that...

Math
the towns highway department marks a new road with reflective markers the road is 6 3/4 miles in length the markers are spaced every length 1/8 of a mile

econ
given p=68-4qd-qd^2 p=12+2qs+qs^2 where p is the price qd is the quantity demanded qs is the quantity supplied determine the uquilibrium and the quantity of the commodity

Basic math
A ladder 10 feet long leans against a building the base of the ladder is 6 feet how high is the paint where the ladder touches the building

Basic math
A 15 foot ladder propped against a wall the base of the ladder is 3 feet from the wall how far up the wall does the ladder reach.

math 1
What is the value of the expression below? (2^-4)(3^0)(7)/(5^-2)(4^-2)(175) Remember: Negative exponents in the denominator move to the top with its base, and negative exponents in the numerator move to the bottom with its base. In both cases you should drop the negative sign...

math 1
How do i put a pitcure because the problem is a picture

math 1
Please help with this i don't under stand it at all Hint: Copy and paste in in the search bar.

math 1
file:///C:/Users/Elvis/Downloads/34c349524b928a5f67768aa8eb6e1c02.png

math
Answer is -16 :)

math
ive got it ive seen my mistake

math
Find the values of x and y in the two equations below then answer the question that follows. 2^-3=1/x 7^y=1/49 What is the value of xy ? For the first problem i got 8. For the second one i got 1/343 I don't know what im doing wrong or right. Can you please show me with work.

Chemistry
Based on the standard reduction potentials given below, which species is most likely to be oxidized? Ag+ + e- → Ag, Eo= 0.80 V Cu2+ + 2e- → Cu, Eo= 0.34 V Zn2+ + 2e- → Zn, Eo= -0.76 V Cd2+ + 2e- → Cd, Eo= -0.40 V I thought the answer would be Zn2+ that...

Chemistery
Calculate the concentration of O 2 if K c = 270 for the reaction 2SO 2 (g)+O 2 (g)⇌2SO 3 (g) .

College Algebra
Tammy can do a certain job in 6 hours. Kris can do the same job in 8 hours. If Tammy and Kris work together to complete the same job, how many hours will it take for them to complete it?

Calculus - Approximation
Use linear approximation, i.e. the tangent line, to approximate cubed root { 1.1 }. The equation of the tangent line to f(x) at x = 1 can be written in the form y = mx+b. Show your work. Do not use a calculator.

Math - Calculus 1
Approximate using derivatives. (Must show work using derivatives!) Do not use a calculator: (1.1)^4 - (1.1)^2

Calculus - Related Rates
Suppose that you are watching a spaceship take off. You are 100 meters from the launch pad, and you measure the angle made by the rocket and the ground to be increasing at a rate of (d)(theta)/dt = 0.1 radians per second. What is the velocity of the rocket when theta = pi/4?

Physics
usain bolt set the world record for the 100m dash, proving to be the fastest man in history, with a time of 9.58s. what was bolt's average speed in miles per hour? (his initial speed was 100m/9.58s I got 23.35 mph for this I need help with this. VVVVVVVVVVVVVV assume that ...

math
Joe is playing a game with a regular die. if the number that turns up is even he will gain 5 times the number that comes up. if it is odd, he will lose 10 times the number that comes up. he tosses a 3. express the results as an integer

College math
A bag contains 9 white 7yellow marbles,8 green marbles. If one marble is drawn from the bag then replaced, what is the probability of drawing a white marble then a green marble?

Help with compute probability
Compute the probability of randomly drawing five cards from a deck and getting 3 Aces and 2 Kings. (Give your answer as a fraction.) Probability

Chemistry
So I've done as you said and have come up with the following: C (g) = 0.0437g H (g) = 0.00583g O (g) = 0.01167g C(mol)=0.00364mol H(mol)=0.00578mol O(mol)=0.000729 I then divide for the ratio (Mm=m/n) and get 12 for C, 1 for H, and 16 for O, making the formula: C12HO16, ...

Chemistry
Sorry, it's 0.06120 g produced 0.1601 g of CO2 and 0.05243 g of H2O

Chemistry
Hey, can someone help me with this? A compound containing only C, H and O was subjected to combustion analysis. A sample of 6.120×10^-2 g produced 1.601×10^-1 g of CO2 and 5.243×10^-2 g of H2O. Determine the empirical formula of the ...

Precalculus
Thank you so much!!! I see what I was doing wrong now. PS: You have good handwriting :)

Precalculus
Yeah, I tried drawing a diagram, but I just keep getting confused.

Precalculus
In triangle ABC, we have AB=3 and AC=4. Side BC and the median from A to BC have the same length. What is BC? Please help, I have no idea where to start.

math
a man sleeps 8 hours a day. how many hours can he sleep in a year?

math
Sara is thinking of a number when she rounds her number to the nearest hundred,she gets 700.What is the greatest number Sara can be thinking of?Explain

Please check my answer(Social Studies)
So what's the answers

Physics
A drag racer starts her car from rest and accelerates at 4.8 m/s 2 for the entire distance of 409 m. How long did it take the car to travel this distance?

Science
Which of the following means using specific observations to make generalizations? A: BIAS B: Subjective C: Deductive Reasoning D: Inductive resoning is the answer c?

Social Studies
yes he is correct 5 is c

home economics
what are the branches of fibre

Physics
A block of mass m1= 3.70kg rests on a 30degree incline and is held stationary by a mass of 1.3kg hanging vertically over a frictionaless pulley at the top. Calculate the value of u (coefficent of friction)

Physics
56.7 m

Math
How do you write 4,000,000,000 + 20,000,000 + 500,000 + 60,000 + 1,000 + 300 + 40

Chemistry
24.332

math
6 people like soccer, 3 like volleyball, 7 likefootball, and 2 likebasket ball show that in tallies

Economics
Consider a single price monopoly that faces a market demand curve for a good is given by the equation 𝑃=100−.1𝑄 and the total cost function is given as 𝑇𝐶=1000+20𝑄+.4𝑄2. a. What is the total fixed cost for this monopoly? P=...

Social Studies
Thank you Anonymous

Social Studies
Everyone needs to chill 1. If Ms.Sue is gay so what, If you don't like it go somewhere else and get the answer 2. Ms.Sue is a human if she got it wrong, OK y'all never made a mistake? Should we be mean to you for your mistake? Shes only human y'all can have a ...

science
The boy A weighs 50 kg and the girl B weighs 35 kg in a seesaw...the board of the seesaw is 3.6 meter... To balance the seesaw where should girl C who weighs 25 kg seat or what particular distance should girl C seat to balance it

Calc
Find the value of m such that y=mx divides the area under the curve y=(1-x)x in [0,1] into two regions of equal area D: D: D:

Math
Solve the equation: (1) 5/2 = 3x; x= (2) 7/2 = 4x; x=

Math
Solve the equation: (1) 5= 6y; y (2) 7/2 = 4x; x

Math
Solve the equation: 9/5 = 1 + m; m

Math
Solve the equation 1) 4= 5y; y = 2) 7/4 = 1 + m; m= 3) 7= 6y; y

Maths
Prove that sin2x+cos2x-1/sin2x+cos2x+1=tanx

Math
A fossilized leaf contains 21% of its normal amount of carbon 14. How old is the fossil (to the nearest year)? Use 5600 years as the half-life of carbon 14.

Science (Biology)
krfkrfrf

Math
A car is traveling at a rate of 35 meters per second. What is the car's rate in kilometers per hour? How many kilometers will the car travel in 3 hours? Do not round your answers.

Math
solve these questions using distributive property 30% Of 10= 30% of 20= 30% of 30=

Calc
a large closed storage rectangular box with a base constructed with two different types of wood. the base is made up of wood $5 per square feet and the top and sides are made of wood $3 per square feet suppose the amount available to spend is $1000 find the dimensions of the ...

math
The angles of elevation of a balloon directly above a straight road, from two points of the ground on opposite sides of the balloon, are 78¡ã15' and 59¡ã47'. If the points are 5000ft apart, what is the height of the balloon?

ENGLISH
A creative writing teacher tells students to publish their writing projects in a nonprint format. Which of the following techniques would not meet the teacher’s requirements?

Chemistry
14 grams of coal undergoes complete combustion in 58 grams of oxygen gas. What volume of gas (measured at 25 degrees celsius and 100 kPa) is present when the reaction is complete?

Calculus
Launching a missile to hit a target 100 miles away. Determine the launch speed of the missile along with the angle at which it's to be fired. Also, show your work and one of the angle that will work. Finally, assume that the only force acting on the missile is gravity.

Maths
The sum of the interior angles o a regular polygon is 30 right angles. How many sides have the polygon?

University of Liberia Chemistry 102
Using a current of 4.75A how many minutes does it takes to plate onto a sculpture 1.50g of CuSO4 solution?

Math
If the 16th term of an arithmetic sequence is three times the fourth term, find the ratio of the 23rd term to the third term.

physics
7.500N

physics
calculate the net force required to give a 3000kg trucks an acceleration of 2.5m/s^2

Calculus- PLEASE HELP
A rectangular piece of tin has an area of 1334 square inches. A square tab of 3 inches is cut from each corner, and the ends and sides are turned up to make an open box. If the volume of the box is 2760 cubic inches, what were the original dimensions of the rectangular piece ...

Calculus
A rectangular piece of tin has an area of 1334 square inches. A square tab of 3 inches is cut from each corner, and the ends and sides are turned up to make an open box. If the volume of the box is 2760 cubic inches, what were the original dimensions of the rectangular piece ...

Calculus- Reiny
Thanks for the help, but do you understand what Im suppoosed to graph on 2D d) Use a graphing calculator to sketch the graph of y = V(x). Use the viewing window [0, 24, 4] by [-2500, 4000, 500]. Then use the 2 nd – TRACE – maximum feature to calculate its maximum ...

Calculus- Reiny
Thanks for the help, but do you understand what Im suppoosed to graph on 2D d) Use a graphing calculator to sketch the graph of y = V(x). Use the viewing window [0, 24, 4] by [-2500, 4000, 500]. Then use the 2 nd – TRACE – maximum feature to calculate its maximum ...

Calculus
A rectangular piece of tin has an area of 1334 square inches. A square tab of 3 inches is cut from each corner, and the ends and sides are turned up to make an open box. If the volume of the box is 2760 cubic inches, what were the original dimensions of the rectangular piece ...

math
Would it be: (-1, 14) and (6,7)?

math
I'm still pretty lost.. :/

math
what are the solutions to the system? y=x^2 - 6x+7 y=-x+13

Chemistry
A Chemist wanted to determine the percentage of calcium carbonate in a sea shell. He collected a number of sea shells which he crushed into a fine powder. To 2.65 grams of sea shell powder he added 25.0mL of 5.0M Hydrochloric acid. When all the fizzing ceased, he filtered the ...

math/algebra
thank you so much. I thought so.

math/algebra
The surface area of a rectangular prism is SA=2lw+2wh+2lh. The volume of a rectangular prism is V=lwh. Write an expression for the ration of surface area to volume.

chemistry
Chromium (III) iodate has a Ksp at 25°C of 5.0 x 10–6. 125 mL of a solution contains 0.0050 mol L–1 Cr (III) ion. When 75.0 mL of the NaIO3 solution have been added, what is the concentration of the Cr(III) ion remaining in solution? not sure how ...

chemistry
The Kb of ammonia is 1.8 x 10–5. What is the percent ionization of a solution of ammonia, 0.50 mol L–1 NH3, that contains 0.020 mol L–1 of ammonium nitrate, NH4NO3? when i use the ICE table i don't end up with an unknown so im not sure what to...

chemistry
thank you! :)

chemistry
At equilibrium, a solution of formic acid at 25°C has a pH of 2.18. The pKa of formic acid, HCOOH, is 3.74. Which of the following is the initial concentration of the solution? Not sure what to do my thoughts: use henderson hasselback equation pH = pKa + log [conj ...

statistics
the amount of pyridoxine in grams per multiple vitamin is normally distributed with mean = 110 grams and standard deviation = 25 grams. What is the probability that a randomly selected vitamin will contain between 100 and 110 grams of pyridoxine?

algebra
y varies inversely with x, and y = 10 when x = 2. What is the equation for the inverse variation?

Chemistry
When the ratio of neutron-to-proton dictates that a neutron must break down it will form a helium nucleus an alpha particle a proton and an electron*** Two protons

Chemistry
Which of the following materials is necessary to stop gamma radiation one foot of concrete single sheet of paper thin pieces of wood three inches of lead***

Math
vvvvvvvvvvvvvb

Calc
Find the number b such that the line y = b divides the region bounded by the curves y = 4x2 and y = 16 into two regions with equal area. (Round your answer to two decimal places.)

math or algebra
F2088nd the next three terms of the sequence. -2, -12, -72, 432. Possibilities are: 1. -1728 -6912 -27,648 2. -1728 -10,368 -62,208 3. -2592 -10,368 -41,472 4. -2,592 -15,552 -93,312 I have tried multiplying positive numbers times the negative but can't make the numbers ...

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