# Posts by Jess

Total # Posts: 1,088

math
r^3r^-4/4^-2r^-5 i tried doing r^3/r^-2 x r-4/r-5 & got r^5,r^1 but the answer is r6, what am i doing wrong?

math
x^7/x^-4 my book says the answer is x11, but how? aren't you supposed to subtract the exponents when dividing?

math
9^-1/9 the formula for this is b^m/a^n but when you do it it doesn't equal 1/81?

math
3^-5/3^-2 becomes 1/3^5/1/3^2 the answer is 1/27, how did they get that? i need step by step to understand

Math - Limits
sorry, it's "t approaching to infinity"

Math - Limits
N(t) = 100t / (t + 9) where t >=0 Find lim x approaching to infinity N(t)

Marketing
Nevermind, I figured it out!

Marketing
I need help filling in the blanks for this price chain in marketing: Manufacturer's Price.............\$15.55 Manufacturer's Variable Costs....\$6.35 Manufacturer's \$ Margin..........\$9.20 Manufacturer's % Margin..........59.2% Wholesaler's Price...

Math
How do you find the intersection of the lines 5x + 2y = 60 and 3x + 2y = 45?

Math
A charter fishing company buys a new boat for \$224,000 and assumes that it will have a trade-in value of \$115,200 after 16 years. Find a linear model for the depreciated value V of the boat t years after it was purchased.

Math - Limits/Derivatives
If a price-demand equation is solved for p, then price is expressed as p = g(x) and x becomes the independent variable. In this case, it can be shown that the elasticity of demand is given by E(x) = - [g(x) / xg'(x)]. Use the given price-demand equation to find the values ...

Math - Limits/Derivatives
Suppose that for a company manufacturing calculators, the cost, revenue, and profit equations are given by C = 70,000 + 20x R = 300x - (x^2 / 20) P = R - C where production output in 1 week is x calculators. If production is increasing at a rate of 600 calculators per week ...

algebra
in the bible, a verse describes a circular pool at king solomon's temple, about 1000 B.C. The pool is said to be ten cubits across, "and a line of 30 cubits did compass it round about." what value of pie does this imply? don't understand the problem or why ...

math
why is every integer a rational number?

math
how do you figure out the pattern of 1,4,9,16?

Math
9x^4 - 148x^2 + 64

math
thanks

Math - Functions
r = -5x^2 + 73x Can someone show me the steps to complete the square for that equation? I don't really understand them.

algebra
4,7,12,19,28,39, I don't see one common difference & how would the next number be 52?

algebra
3,6,9,15, 24,39 what is the next number in the sequence & why? i know it's going by 3 but its skipping numbers so I'm not sure if it would be 45,48,51,54,57,60,or 63

Calculus
Find the slope of the functions graph at a given point. Then find an equation for the line tangent to the graph there. f(x)=2*square root of x. (1,2) Could someone please help me figure this one out?

Statistics
The table got messed up, but for each category, the first number is for males, and the second number is for females!

Statistics
A Youth Correction Center completed a study to explore the proportion of delinquent behaviour, according to birth order, among two groups of teenagers (males and females, age 12-17). The data are given in the table below. Determine whether there is a difference between male ...

Math - Decimals
Is 0.052 or 0.05 a bigger number?

Math - Probability
Annabelle wants to move to a new city. If her chance of getting a job in Montreal is 10%, and her chance of getting a job in Vancouver is 35%: 3a) What is the probability that Annabelle will be offered both jobs? 3b) What is the probability that she will only get one of the jobs?

PreCalculus
cotx + tanx=

math
Suppose Apple’s stock rose to \$139 at the end of the week and it was up 4% from the previous week. What was the price of Apple’s stock at the previous week’s close?

MATH
Suppose a third world country in the last five years is now expanding their Internet access. If they went from 2.5% of their citizens having access to the Internet to 7.5% now having access, calculate the following: a) How many percentage points did they increase in access? b...

immunology
do monocytes derive from killer T cells?

Chem

Chemistry
Zinc has three major and two minor isotopes. For this problem, assume that the only isotopes of zinc are the major ones, zinc-64, zinc-66, and zinc-68. The atomic mass of zinc-64 is 63.9291 Da, that of zinc-66 is 65.9260 Da, and that of zinc-68 is 67.9248 Da. Calculate the ...

Matrices (math)
0.433= (45.6*A) + (3.152*B) 0.3363= (11.92*A) + (37.675*B) Solve for A and B using matrices

Chemistry
Solve for A and B 0.433= (45.6*A) + (3.152*B) 0.3363= (11.92*A) + (37.675*B)

math
You need to hire a part-time associate to work 30 hours a week in your store. You have \$250 in labor budget for the new associate each week. You just interviewed an excellent candidate for the position who has requested to be paid \$9.00 per hour. Your average part-time ...

Chem
An electrochemical cell based on the decomposition of H2O2 can be constructed based on the half-reactions in the table below. Half-Reaction | Standard Reduction Potential, E° H2O2+ 2e- => 2 OH- | 0.88 V O2+ 2 H2O + 2e- => H2O + 2 OH- | -0.15 V (d) Calculate the value...

Chem
Ca(s) + 2H+(aq) → Ca2+(aq) + H2(g) An experiment is performed to determine the volume of hydrogen gas produced when calcium reacts with excess HCl(aq) as represented by the net ionic equation above. A 0.0720 g sample of pure calcium and a solution of 1.0 M HCl(aq) were ...

AP Chem
CH3CH2NH2(aq) + H2O(l) <-> CH3CH2NH3+(aq) + OH-(aq) Kb = 5.0e-4 Ethylamine, CH3CH2NH, a weak base reacts with water according to the equation above. A 50.0 mL sample of a ethylamine solution is found to have a pH of the solution 11.60. (a) Write the expression for the ...

Science
Explain why would a bottle that is left overnight with water is crack but a empty bottle would not.

Scoence
Explain why would a bottle that is left overnight with water is crack but a empty bottle would not.

Macroeconomics
GDP of a country is 6000 billion. Investment is 2100 billion. Government purchase is 300 billion. The country has a trade surplus of 200 billion. How much is consumption? Was there net capital inflow or outflow? Can someone help start me off for this?

Write a chemical equation that shows how acid rain H2SO3 was produced from SO2 gas and water in a zip sealed bag? My chem. teacher never explained how to do this and I have several other questions on this type of subject. If you could help me out it would help me tremendously...

Chem 1
Write a chemical equation that shows how acid rain H2SO3 was produced from SO2 gas and water in a zip sealed bag? My chem. teacher never explained how to do this and I have several other questions on this type of subject. If you could help me out it would help me tremendously...

Macroeconomics
The money supply in Freedonia is \$200 billion. Nominal GDP is \$800 billion and real GDP is \$400 billion. Assuming that velocity is stable, if real GDP grows by 10 percent this year, and if the money supply does not change this year, what is the change of price level?

Algebra
I have one question I really need help with. I know the partial sum process but my numbers don't seem to come out to what I think it should be. Find the partial sum S6 1. An=3n+2

I have two left I need help with and don't understand. Find the partial sum S6 1. An=3n+2 2. Find the number of terms n in an arithmetic sequence if a1=20, d=5, and An=75.

Algebra
Thanks for the help bobpursley and Reiny I appreciate showing how you got to it so I can also do it.

Algebra
I have 3 questions I'm stuck on and would love for someone to explain and show me how to solve them so I can also solve the other one. Find the partial sum S6 1. An=3n+2 2. Find the number of terms n in an arithmetic sequence if a1=20, d=5, and An=75. 3. Find the general ...

Algebra
I have a few problems I need some help with. The first is Evaluate the sum. 1. There is an E like symbol on the top is 10 on the bottom n=1 and to the right (7-2n) 2. The next question is find a10 for an arithmetic sequence with a1=6 and d=10 3. Find the number of terms in the...

Math
A theater group made appearances in two cities. The hotel charge before tax in the second city was \$1000 higher than in the first. The tax in the first city was 4% , and the tax in the second city was 7% . The total hotel tax paid for the two cities was \$455 . How much was the...

Calculus
Calculate the area of the common interior of r = 2sin(theta) and r = 2cos(theta)

physics
A person weights 685 N in air but only 497 N when standing in water up to the hips. Find (a) the volume of each of the person’s legs and (b) the mass of each leg, assuming they have a density that is 1.05 times the density of water.

I have to write a research paper on MBWA (Management by walking around) but I honestly can't think of any good thesis's, or topics to write about. Any ideas?

AP Calc Help!!
Let f be the function satisfying f'(x)=x√(f(x)) for all real numbers x, where f(3)=25. 1. Find f''(3). 2. Write an expression for y=f(x) by solving the differential equation dy/dx=x√y with the initial condition f(3)=25. Please show work and reasoning.

Math
Simplify: 5th roof of (6th root of 10 * sqaure root of 1000) or: (10^1/6 * 1000^1/2)^1/5 (^ another way of writing it)

physics
You're in an auto traveling at 25.0m/s toward a pole mounted warning siren. If the siren's frequency is 365 Hz, what frequency do you hear? Use 343m/s as the speed of sound.

Math
7.24 multiplied by 3.4. Find the solution and round to the tenths. I'm confused I have two answers

Quantum M.
Why "In Hilbert Space noone can hear you scream"?

math
16.7%

math
this was emily's full day yesterday: she spent 8 hours sleeping, 1 hour in the shower, 6 hours in class, 2 hours eating and snacking, 4 hours studying, and 3 hiurs watching tv. What percent of her day was spent studying.

math

math
a movie theater has 250 seats. One hundred tickets have been sold. What percent of fhe theater is filled?

maths
A particle of mass 4 kg is attached to one end of an inelastic string and a particle of mass 2 kg is attached to the other end of the string.The string has length 4m and is hung over a smooth pivot at its midpoint. The Pivot lies 3m above the ground.How long does it take for ...

Calculus AP
Added spaces for it to let me add the picture. h t t p : / / g o o . g l / v S l t p

Calculus AP
Let R be the region bounded by the graphs of y=cos((pi x)/2) and y=x^2-(26/5)x+1. A. Find the area of R. B. The vertical line x=k splits the region R into two equal parts. Write, but do not solve, an equation involving integrals that solves for k. C. The region R is the base ...

Calculus AP
I spaced it out. This the picture. h t t p : / / g o o. g l / A h g J X

Calculus AP
Let R be the region in the first quadrant bounded by the graph y=3-√x the horizontal line y=1, and the y-axis as shown in the figure to the right. Please show all work. 1. Find the area of R 2. Write but do not evaluate, an integral expression that gives the volume of ...

Math
Oh I get it now, okay thank you very much!!

Math
Dalia made 8 party bags for her birthday party. Each bag contained 4 small gifts for her friends. When Denis said that she could come, Dalia had to make one more bag with 4 gifts. How many small gifts did Dalia need to fill her bags? Walter wrote this number model: 8 x (4+4)=...

maths
1) Suppose that an insect crawls in a plane in a path given in polar coordinates by r = be^kt; theta = kt; where b; k are positive constants and t is time.Find the velocity and acceleration vectors of the insect. Show that the angle between the velocity and acceleration ...

Math
How do you solve g? 4 = (1 + g)^20

Macroeconomics
Suppose GDP is \$800 billion, taxes are \$150 billion, private saving is \$50 billion and public saving is \$20 billion. Assuming this economy is closed, calculate consumption, government purchases, national saving and investment.

math
Suppose that you deposit \$1735.50 in a savings account that pays 9.25% annual interest with interest credited to the account at the end of each year. Assuming no withdrawals are made, find the balance in the account after 4 years

Math
What are the steps to solve for n?: 50000 = 1000(1 + 0.8)^n

maths
1)is the ring of real polynomials R[X] countable and why ?

maths
Let a, b, c and d be vectors. (i) Show that (a - b) * (a + b) = a^2 - b^2

Physic
A block (mass 2.4 kg) is hanging from a massless cord that is wrapped around a pulley -3 2 (moment of inertia of the pulley = 1.3 x 10 kg·m ), as the drawing shows. Initially the pulley is prevented from rotating and the block is stationary. Then, the pulley is allowed ...

English
Thank you so much!

English
Rephrase the main idea of the sample in your own words, without repeating words or sentence structure from the original statement. (I honestly can't seem to decide on how it should be worded) "Air pollution can also have a significant impact on our economy. It can ...

English
I have: NPD have pointed out that smartphones have rapidly increased 84 percent from 2007 to 2008, and are currently selling fast in America.

English
Rephrase the main idea of the sample in your own words, without repeating words or sentence structure from the original statement. "Right now, smartphones are selling like mad in the U.S. market, where sales jumped 84 percent between 2007 and 2008, according to NPD, the ...

East
I need an equation that has something to do with the role of static friction in the design of tires

maths
n! is greater or equal to 2^n-1 prove by induction

math
A tree is struck by lightning. The top part breaks and falls to the ground. The part of the tree still standing is 30 feet tall and the top part that hit the ground is 40 feet from the base of the tree. How tall was the tree originally?

maths
integrate by parts integrate (4+x^2)^1/2

ap calculus
I'm sorry... I'm just not super comfortable posting my name on the web... Can you still please help me??

ap calculus
Which of the following definite integrals gives the length of y = e^(e^x) between x=0 and x=1? All the answers are preceded by the integral sign from 0 to 1. (a) sqrt[1 + e^(2*(x+e^x))] dx (b) sqrt[1 + e^(4x)] dx (c) sqrt[1 + e^(x+e^x)] dx (d) sqrt[1 + e^(2e^x)] dx (e) sqrt[e...

chemistry
Sorry but what do Ka/Kb values tell me?

chemistry
I know caffeine is more polar than salicylic acid but how would I explain that given their respective structures? I know for smaller molecules you would figure out the polarity of individual bonds and the molecule's geometry but I can't figure out how to transfer this...

Math
He's allowed to keep it is the fish is exactly 22 inches so you need to find the difference between 22 and the actual length of the fish (i.e. subtract how long the fish is from 22)

chemistry
Please help. My teacher never went over crystal lattices and the book doesn't cover it either :( Copper crystallizes in a face-centered cubic lattice. If the edge of the unit cell is 351pm, what is the radius of the copper atom?

Social Studies
In what ways did China And Europe parallel each other in their development until the sixth century CE? How did they diverge after that?

math
in order to increase the mean of 6 numbers by 3, what would the total sum of the increase be? A. 3 B.9 C.12 D.16 E.18

MATH urgent
Hello!! 1. find the third derivative of f(t)=(t-1)/(t+1) 2. y= x^(x^2) ; dy/dx please help! thank you!

Fats help maintain your cell membranes. (1 point) True False 12. Your body does not use energy when you sleep. (1 point) True False 13. People with anorexia nervosa eat large amounts of food and then purge. (1 point) True False 14. Your body image is the way others see your ...

maths
Let p(x) = 1 + 4x + 2x^2 + 2x^3 in Z5[x]. Find all roots of p(x), and write p(x) as a product of irreducible polynomials.

maths
differentaite w.r to x h(x) = arcosh(x^3 + 2).

pre cal
How lnog will it take for an investment of \$1000 to double in value if it earns 5% coumpounded weekly?

Maths
in the following rings find all units, Zero divisors and idompotent elements and determine whether the ring is a field. a)Z2 b)Z5 c)Z10 NB z is integers( positive or negatives including zero z is integers( positive or negatives including zero

physics
An object moves along a circular path with a constant speed, |⃗vo|. (Semi Circle with point A on one side point B on the other. Looks like a 90 degree angle with points A and B on either side of the hypotenuse.) The average acceleration in going from A to B is 1. zero 2...

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