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Posts by peter

Total # Posts: 1,018

Math
Write the first four terms of the sequence defined by the recursion formula. a1 = 6 and an = 3an-1 for n ≥ 2

Math
Ok...I get it. Thanks.

Math
The percent decrease from 5 to 4 is how much less than the percent increase from 4 to 5? A. 0% B. 5% C. 15% D. 20% E. 25%

Pre-Calculus
Oh...okay. Thanks for the help.

Pre-Calculus
If θ represents an angle such that sin2θ = tanθ - cos2θ, then sin θ - cosθ = A. -√2 B. 0 C. 1 D. 2√2 What equation can I use to solve this problem?

math
174

Physics
A gas is sealed in a container with rigid walls that allow heat to flow through them. A thermal process takes place on the gas. What would be the best model for the type of process?

chemistry
how many gram of NaNO3 are in 25cm3 of 0.01m NaNO3 solution?

Physics
A large air-filled 0.1-kg plastic ball is thrown up into the air with an initial speed of 16 m/s. At a height of 4.7 m, the ball's speed is 5 m/s. What fraction of its original energy has been lost to air friction? (Note that the initial height is taken to be zero.)

statistics
„« If the city spends $145,000 on promotional expenditures. What will be the projected attendance at 95% confidence level?

science
Please help. Concentrated hydrochloric acid is a 38% w/w solution of HCL in water and has a density of 1.18g/ml. How many millilitres of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 w/v HCL solution? My answer is 2.12ml. I'm not sure if its correct...

chemistry
1:200 w/v means 1g in 200ml

chemistry
Please help. Concentrated hydrochloric acid is a 38% w/w solution of HCL in water and has a density of 1.18g/ml. How many millilitres of concentrated hydrochloric acid are needed to prepare 500ml of a 1:200 w/v HCL solution? My answer is 2.12ml. I'm not sure if its correct...

math
(x-16)^2=64

life orintation
identify and describe one environmental problem that causes ill health,crises,accidents,and disasters within your community or any other community within south africa or globally

East Asia,and south easia
A. Both Cambodia and Vietnam carried out ethnic eradication programs against hill people. B. The Khmer Rouge leaders have never been brought to trial. C. The leaders of the Khmer Rouge fled from Cambodia after 1979. D. Chinese merchants living in Cambodia and elsewhere have ...

L.o
Limpopo

Organic Chem
Outline a separation scheme for isolating pure isopentyl acetate from the reaction mixture.

physics
A spring whose spring constant is 650 N/m is compressed 0.300 m. What speed (in meters/second) can it give to a 0.300 kg ball when released

Math(Algebra)
Determine whether the pair of lines are parallel, perpendicular, or neither. 1)f(x)=2/3x+1 2)2y+3x=1

chemistry
I don/t know

Geometry
Sorry Steve, you made a major error with your units... the radius of the Earth is around 6378 km not 6378 miles. You are trying to find the distance from the Space Station to the horizon, which would be the point of tangency. The tangent line from the Space Station will form a...

calculus
At a quarry, sand is filling off a conveyor onto a conical pile at a rate of 15 cubic feet per minute. The diameter of the base of the cone is four times the height. At what rate is the height of the pile changing when the pile is 12 feet high?

Further maths
Y=x^3-6x^2+9x-4.calculate the average rate of change of y with respect to x.

math
What inverse operation is needed for the first step in solving the equation 12+5x=22? a. addition b. subtraction c> multiplication d. division

math
Xenia wants to stuff a cube-shaped footstool that measures 10.25 inches on all edges. What is a good estimate of the number of cubic inches of foam peanuts that she will need? a. just over 1,331 cubic inches b. just over 1,000 cubic inches c. just over 30 cubic inches d. just ...

calculus
A tank consists of a right circular cylinder at height (h)surmounted by a hemisphere at a radius (r) with an outlet atthe top. The tank is full of water at density ρkg/m3. Find the work required to empty thetank.

math
A recipe for one large cake calls for 3 2/3 cups of flour. Anya has decided to increase each ingredient in the recipe by 2 1/2. How many cups of flour does she need?

Social 30-1
that site doesnt work for me

Social 30-1
hello i am doing a recearch project on Hong Kong and one of the questions are: what are your countries Fiscal and monentary policies? i cant find them anywhere. if i could get your help that would be great!

Biology
I'm confused on the rule of multiplication and the rule of addition. When do I use each to determine the probability of a genetic trait being inherited.

maths
Like simultaneous equations? p + 18 + q = 1/8p - 4.5 +q I get -25.71..... Is this right?

maths
f(x)=px^3 + 6x^2 + 12x + q given that the remainder when f(x) is divided by (x - 1) is equal to the remainder when f(x) is divided by (2x + 1), (a) find the value of p. given also that q = 3, and p has the value found in part (a) (b) find the value of the remainder. my working...

Biology
The observed distribution of offspring was: black-red 1,070; black-white 177; green-red 180; green-white 1,072. Based on these data, what is the recombination frequency? A. 86% B. 7% C. 17% D. 14% E. 30% Background Info: In a particular species of mammal, black hair (B) is ...

Biology
Jessica has no dimples and attached ear lobes. Jessica's mother has dimples and detached ear lobes, and her father has no dimples and attached ear lobes. Assuming independent assortment, what are the chances that her new baby brother will have dimples and attached ear lobes?

cch
a bridge over a river is loaded at three penal points. determine the support reactions at a and b

Algebra 2
Solve each equation below for x. (Use logarithms.) 10^(2x^(2)-5x+11) = 10000 9^(2(x-1)) = √(27)

Algebra 2 Decay
You have 20 grams of phosphorus-32 that decays 5% per day. How long will it take for hlaf of the original amount to decay?

Inequalities
Budgets her monthly take-home. The remainder she deposits in her savings account. she budgets 1/3 rent. 1/8 for car 1/6 food, 1/24 insurance. and 1/16 for entertainment, What is her monthly take-home pay if she deposits $546.00 in her savings account?

Social 30-1
im not asking them to write the assignment. just want some ideas. i have to write an essay and im not expecting people to do that.

Social 30-1
Who benefited from the growth of classical liberalism during the industrial revolution? Who did not benifit from it? Why didn't the theorys of classic liberalism extend to all classes and people?

economics
Suppose that there are three beachfront parcels of land available for sale in Asilomar and six people who would each like to purchase one parcel. Assume that the parcels are essentially identical and that the minimum selling price of each is $600,000. The table below reflects ...

Social 30-1
Who benefited from the growth of classical liberalism during the industrial revolution? Who did not benifit from it? Why didn't the theorys of classic liberalism extend to all classes and people? please help

math
Drew was leveling a table. One corner had to be raised 3/4 inch. He had some pieces of wood 1/16 inch thick. How many pieces of wood would he need to use for the corner to make the table level?

math
The temperature outside rose 41 degrees during a 12 hour period. If the temperature rose the same number of degrees every hour, what is a good estimate of the number of degrees the temperature rose each hour?

Biochemistry
Thanks Doc!

Biochemistry
1. MES (2-(N-Morpholino)ethanesulfonic acid) is a common buffer used in biochemistry labs to stabilize proteins. The pKa for MES is 6.09. a. What is the pH of 1 liter of a 200 mM MES aqueous solution? Clue: you will need to solve a quadratic equation. (2.5 points) b. How much...

Maths
In how many places does y=4x^2-2x-5 cross the x axis?

math
Clara's pay from her paper route is based on the expression $15 + $0.10p, where p is the number of papers she delivers during the wiik. What would her weekly pay be if she deliver 315 papers each week?

Math
My son is grade 4 his homework have question is : when you multiply any number by 1,what is the product ? Please help !!!!

Math
when you multiply any number by 1,what is the product ?

Maths
solve 3^x=4^(x-2)

Algebra 2
An orange grower finds that she gets an average yield of 40 bushels per tree when she plants 20 trees on an acre of ground. Each time she adds a tree to an acre, the yield per tree decreases by 1 bushel, due to congestion. How many trees per acre should she plant for maximum ...

Algebra 2
What is the maximum product of two numbers whose sum is 22? What numbers yield this product?

Algebra 2
A rancher is fencing off a rectangular area with a fixed perimeter of 76 m. What dimensions would yield the maximum area? Find the maximum area.

Algebra 2
Consider a circle centered at (2,4). What are the coordinates of the center of the translated circle if we replace x with x-3 and y with y+5 in the equation of the circle?

math
Give each letter of the alphabet a money value: A= 1 penny, B= 2 penny, C= 3 penny,and so on.Find words worth 1/5 dollar, 9/10 dollar, 1 1/20 dollars, and 1 1/2 dollars.

math
Give each letter of the alphabet a money value: A=1c, B=2c, C=3c,and so on.Find words worth 1/5 dollar, 9/10 dollar, 1 1/20 dollars, and 1 1/2 dollars.

Algebra 2
Find the equation of the parabola that goes through the given points. (1,2) (0,5) (-1,14)

Algebra 2
The perimeter of a rectangle RSTV is 44 ft. Find the least value of the diagonal RT.

math
A soccer game started at 11:10 a.m. and lasted 1 1/2 hours. About what time did the game end? (A) 12:30p.m. (B) 1:30p.m. (C) 12:00a.m. (D) 1:00a.m.

math
Find digits A and B in the number below so the folling condition are true. The 5-digit number must be divisible by 4. The 5-digit number must be divisible by 9. Digit A cannot be the same as Digit B. 12A3B Explain the steps you followed to solve the problem.

Math 30 pure
why thank you!

Math 30 pure
simplify: (x+y)^10 simplify: (2a+5)^5

English
what are 4 main disadvantages of visiting other countries?

Biology
I go with B. It makes more sense that way. DNA never leaves a cell only messenger RNA does.

math
suppose you deposited $3000 of earned income into an IRA, you can earn an annual interest rate of 8%and you are in a 40% tax bracket (Note:interest rates and tax brackets are subject to change over time, but some assumptions must be made to evaluate the investment) Also, ...

maths
find the distance in kilometers traveled by an areoplane moving at 150km/h for 50minutes.

english
Thank you Writeacher.

english
I have to find three or four nouns, adjectives, adverbs and verbs from a book. Please can you tell me if I am right? noun - Stanley, lizard, toothbrush. adjectives - sweet, fresh onions. The answer sweet,fresh. He suddenly realised where he'd seen the gold tube before. The...

math
A certain kind of bacteria doubles in quantity every hour. At midnight two nights ago. only two of these bacteria were in a jar. At midnight last night, the jar was full. At what time was the jar half full?

science
My question is ' what do you think if we lived in a world without any plants?' I have tried typing this in a search engine and it came up with nothing. Please could you help give me a website. Thank you.

college physics
I don't know where to begin with this question. Could someone help me please? A rod of mass 4.1 kg and length 1.6 m hangs from a hinge as shown in the figure below. The end of the rod is then given a "kick" so that it is moving at a speed of 5 m/s. How high will ...

math
(1A) Write the 11-digit number that has a 2 in the ones place,1 in the tens place,a digit in the ten-thousands place that is twice the digit in the ones place,the smallest odd digit in the billions place, 6 in the tenths place, and 0 in all the other places. (1B) How did you ...

3 grade math
12+6=18

Algebra 2
Show that for any complex number z, |z| = |-z|. (Hint: Let z = a + bi.)

math
ben has finished homewok during holiday.he does 2/3 of remaining question each days. after 4 days, 4 question are left .how many question he all together to do ?

Physics
A ball, of mass 0.3Kg, is held on the inside of a smooth hemispherical bowl at a height 0.15 m above the base. It is then released. Assuming there is no friction, the acceleration due to gravity, g, is 10 m/s2 and the potential energy is zero at the base of the bowl - What is ...

Math61
R is bounded by Y=2x-x^2 and the x-axis. Find the centroid of R. Sketch the region.

physics
Two forces, 422 N at 24 and 278 N at 29 are applied to a car in an effort to accelerate it. mass of the car is 3000kg Find the resultant of these two forces. Answer in units of N Find the direction of the resultant force (in relation to forward, with counterclock- ...

Biology
Which functional group is most likely to be responsible for an organic molecule behaving as a base (-OH donator / H+ acceptor)? A. Phosphate B. Amino C. Hydroxyl D. Carbonyl E. Carboxyl

Biology
If a protein's primary structure is predetermined or directed by a "source." what might this "source" be?

Biology
There are 20 amino acids that cells use to build the numerous amounts of proteins that are essential for life. If a protein molecule consisted of 100 amino acids, how many combinations are possible? What is the probability that out of the total possible combinations of the 100...

event driven programming
8. Write a visual basic program that accepts basic pay, allowances and tax of ten employees computes gross pay and net pay of each of the employee.

Algebra 2
When x² - 3x + 2k is divided by x + 2, the remainder is 7. Find the value of k. Use synthetic division to do so.

math
Joel and jacob are brothers. This year both of their ages are prime numbers. Last year both of their ages were composite numbers.Both of their ages will be composite numbers again over the next three years. If joel and jacob are both teenagers, how old are they now?

Algebra 2
When two rational expressions are divide, the quotient is 5x² + 3x + 12 + 7/(x + 5. What are the two polynomials?

Algebra 2
Please use the long division method for this problem.

Algebra 2
(4a³b + 5a²b² + a⁴ + 2ab³)÷ (a² + 2b² + 3ab)

Science (urgent)
Assuming you meant an arrow instead of a "Reserved" sign, it should be B, Product. The substrate is something being acted upon in a reaction (I'm assuming this is for a biology/biochemistry class, so in that case the substrate is what's being acted on by the ...

physics
I'm assuming you're referring to kinetic friction here, in either case (static or kinetic friction) however the following method is able to find the answer. Friction=mass*g*friction constant In this case the force of friction is equal and opposite to 20N, so Friction...

physics
Acceleration is equal to change in velocity over time. In this case the velocity is constant, so the change is 0. 0 divided by anything is 0, so there is no acceleration (a=0 /s^2)

Physics
You just need to calculate Jane's kinectic energy before she grabs the vine (.5mv^2). This will be equal to her gravitational potential energy (mg*height) at the top of her swing. .5mv^2=mgh -cancel the mass on both sides .5v^2=gh 19.22=9.8h h=1.96

physics
objects of masses m1=4 kg and m2=9kg are connected by a light string that passes over a frictionless pulley. the object m1 is held at rest on the floor and m2 rests on a fixed incline of delta=40 degrees. the objects are released from rest and m2 slids 1.00 m down the ...

physics
A falling skydiver has a mass of 123 kg. (a) What is the magnitude of the skydiver's acceleration when the upward force of air resistance has a magnitude that is equal to one-fourth of his weight? 7.35 m/s^2 (b) After the parachute opens, the skydiver descends at a ...

Physics
A box is sliding up an incline that makes an angle of 12.0° with respect to the horizontal. The coefficient of kinetic friction between the box and the surface of the incline is 0.180. The initial speed of the box at the bottom of the incline is 1.30 m/s. How far does the ...

Algebra 2
Factor. -16 + 17(5-y²)-(5-y²)² and [x + y + 1][x² - x(y + 1)+(y + 1)²

Algebra 2
Factor. (y-1)⁴ - (y-1)²

Algebra 2
Factor.

Algebra 2
1/16(x)^3a + 1/2(y)^(6a)(z)^(9b)

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