# Posts by jeremy

Total # Posts: 291

Math Trigonometry
Hi guys, I was wondering if you guys can help me with this question. I'm not sure how to do this question. As I keep on getting something that's out of the unit circle. Please help! 17sec2(?)-13tan(?)sec(?)-15=0

Math
Anna is making fruit punch and iced tea to serve during the day. She starts brewing the tea for the iced tea. The recipe for iced tea requires 3 tea bags for every 5 cups of water. Write an equation that can be used to determine the amount of water, c, in cups, needed for t ...

math
an 8 ft. piece of board must be cut from a 10 ft. two-by-four. allowing 0.125 ft. for the saw blade, how many inches long is the remaining piece?

riddle
rain

Math check - Statistics
Forgot to add that the sex ratio is even and both have the same prevalence.

Math check - Statistics
Can someone (preferably one of the long-term tutors) check my answers: Researchers trap 23 devils, and find that 18 of them are infected. Provide an estimate of disease prevalence. p-hat = (18/23)=0.783 Part II: assuming the same disease prevalence from above. If they trap 2 ...

Math
Latasha can read 15 pages in 25 minutes. At this rate, how long will it take her to read a 1045 page novel?

finance
Concluding financial markets are important in a person's daily life and are easier to handle, on how technology is today. Could you help rephrase this please

Math
A laboratory technician has a 20% and a 40% acid solutions. What amount of each solutions should be used in order to make 300ml of 28% acid solution?

Math
Casies invested one part of her \$10,000 at 7.5% interest per year and the other part at 8.5% per year as well. Her income from the two investments was \$820. How much did she invest at each rate of interest?

physics 11
Timmy twirls a dead rat (mass = 2 kg) attached to a rusty chain (length = 1m) in a vertical circle. With what velocity should Timmy rotate the rodent so that the chain just goes slack (no force in the chain) at the top? pls answer :(

math
How many cubic feet are there in a room 20' long × 12' wide, with a ceiling 8' high

college chemistry
calculate the equilibrium constant for the following reaction at 298k given that DeltaGrxn=2.8kj/mol N2O4-2NO2 I thought to get K you use the expression K=e^(-deltaG/(RT)) but I cant get the same answer my professor put down which is 3.1

Brief Calculus
Increasing and Decreasing Functions. Let f(x) = 4x^3 - 9x^2 -30x +6 A. Find all critical numbers of f(x) B. Give the open intervals where f (x) is increasing and decreasing and clearly label each.

Math
So Prize money of \$500 is divided between Alan & Jim so that Alan receives \$170 more than Jim How much does each receive ----- Using one variable:: Let Jim have "x" Then Alan has "x+170" ---- Equation: x + x+170 = 500 2x = 330 x = \$165 (Jim's share) x+...

Physics
Two large parallel plates are separated by a small gap of distance 2 mm. See figure below. A fluid with dynamic viscosity µ = 10-3 Pa.s fills the gap between the plates. The surface area of each side of the plates is 2 m2. The top plate has a velocity 2.0 m/s in the x-...

Math
I want to include a new 20m x 58m swimming pool in the athletic center. I am submitting a scale drawing on an 8.5" x 11" sheet of paper. Which scale should I use to create as large a drawing as possible on the paper? 1/8"= 1m 5/16"= 1m 3/16"= 1m 1/4&...

calculus
A wooden artifact recovered from a tomb contains 29% of the carbon-14 that is present in living trees. The half life of carbon-14 is 5730 years. How long ago was the artifact made?

biology
A researcher wanted to know how many fish were in a dam.He caught 20 fish and marked them by clipping out a small section of their tail fins.He then released them back into dam.A few days later he caught 25 fish and found that 8 had been marked 1.estimate the total number of ...

math
Min wants to create a figure using half as many tiles as an original figure that uses 25 tiles (15 gray and 10 white.) How many gray tiles will she use? I figured half of 25 is 12 and a half and half of 15 is 7 and a half. So I think she would use 7 and a half gray tiles.

FIN/370
the annualized cost of the trade credit terms of 5/10, net 75 is ___%

chemistry
A compound is found to contain 15.12 % phosphorus, 6.841 % nitrogen, and 78.03 % bromine by weight. what is the emperical formula

chemistry
14g of lithium hydroxide dissolves in 500cm^3 of water.in titration ,30cm^3 is used to neutralise sulphuric acid of 0,2mol.dm^-3 how do i calculate (a)concentation of a base

Math
An orienteer runs for 4.5km, then turns through and angle of 32 degrees and runs for another 6km.How far is she from her starting point?

geometry
What is scale factor for the dilation of segment AB into segment CD? Draw the dilation of segment AB with scale factor 2/3 and label it segment EF. The figure is 2 || segments with point A(3, -3) with B(6,3). Other segment is C(4,-4) with D(8,4). Cant seem to get it figured ...

geometry
I have triangle ABC. Bottom is AC with midpoint F. There is a point under F called P with a little backward Z connecting F & P. A segment goes from D (midpoint of AB)to P and from E (midpoint of BC) to P. I got AD=3; BC=8 I have AF=7. I don't know how to figure out AP? Any...

geometry
do you compare the graphs of y=1/x with y=-10/x; y=1/x with y=1/x+3 + 3?

Math
Determine how many triangles can be drawn. Calculate, then label, all side lengths to the nearest tenth and all interior angles to the nearest degree. a= 2.1 cm, c= 6.1 cm, <A=20 degrees. Isn't height c sin A and therefore h=2.1 cm and therefore only 1 90 degree ...

Chemistry
There's reaction involving gas: Fe + H2SO4 -> Fe2(SO4)3 + H2O + SO2 How Fe2(SO4)3 is occur? I know the "2" comes from the ion of SO4, but I don't know where the "3" comes up. Is the Fe2(SO4)3 comes up from half-reaction method? Is the reaction ...

Probability
1) 7/12 3) .625 4) .749267 The other questions I don't know the answers to.

pre-cal
One campus of Houston community college has plans to construct a rectangular parking lot on land bordered on one side by a highway. there are 640 feet of fencing available to fence the sides. let x represent the length of each off the two parallel sides of fencing.

health
Pulmonary ventilation is also referred to as ________.

Chemistry
I thought that was the case too, sorry if I am overthinking it and thank you!

Chemistry
An unknown metal with a mass of 260 g has a heat capacity of 100 J/oC. What is the specific heat of the metal? I am stuck finding the right equation, knowing that the mass is 260 g and heat is 100 J per Celsius. Thus, going with the equation, q=msT, the equation should fit in ...

math
Let X be a Binomial random variable with parameters n and 0 < p < 1. Show that lim E(1 + X) · E(1/1 + X)= 1. n→∞

statistics
Let X be a Binomial random variable with parameters n and 0 < p < 1. Show that lim E(1 + X) · E(1/1 + X)= 1. n→∞

statistics
Let X be a Binomial random variable with parameters n and 0 < p < 1. Show that lim E(1+X)·E(1+X)·E(1/1+X)=1. n→∞

Physics
A mass of 9.8 kg is moving in the positive x direction at 16.6 m/s and collides in a perfectly elastic, head on collision with a mass of 12.7 kg at rest. The same mass of 9.8 kg in the positive direction at 16.6 m/s also collides with the mass of 12.7 kg at rest in an ...

Chemistry
What is the molarity of a solution made by mixing 213.6 ml of 1.5 M NaCl with 328 ml of 4.3 M NaCl?

chemistry
Calculate the number of GRAMS of carbon dioxide (CO2) produced when 100 grams of methane (CH4) are completely burned in oxygen (O2).

physics
At a distance of 1 cm from the source, the flux from the isotropic source is one hundred times brighter. Which source is brighter fifty centimeters away? At what distance from the source are the two equally bright? Could you explain the theory behind the answers too? Isn't...

computers
In a 350 word written paper, using pseudocode, write a program on how you turn a corner in an automobile. Note that there is a stop sign in the intersection. Determine the logical steps involved and write the pseudocode. Consider the following questions when completing your ...

statistics
The Graduate Record Exam (GRE) has a combined verbal and quantitative mean of 1000 and a standard deviation of 200. Scores range from 200 to 1600 and are approximately normally distributed. What percentage score above 1300? What percentage score above 800? What percentage ...

algebra
Alicia finished the race 3.75 seconds befor Kaye. Donna finished the race5.09 seconds after Carmen. Carmen finished the race 10 second before Kaye. Anders finished 4.89 seconds after Kaye. How many seconds earlier did Carmen finish than Anders?

physics
What, roughly, is the percent uncertainty in the volume of a spherical beach ball whose radius is r = 0.84 ± 0.04m ?

math
Ivanna is going to rent a truck for one day. There are two companies she can choose from, and they have the following prices. Company A charges 114 and allows unlimited mileage. Company B has an initial fee of 65 and charges an additional 0.70 for every mile driven. For what ...

Chemistry 12
calculate the Ph of a solution composed of 0.75 grams of KOH dissolved in 500ml of water. assume total ionization.

Geometry
Martin wants to use coordinate geometry to prove that the opposite sides of a rectangle are congruent. He places parallelogram ABCD in the coordinate plane so that A is (0, 0), B is (a, 0), C is (a, b), and D is (0, b). What formula can he use to determine the distance from ...

Chemistry
calculate the concentration of the silver ion remaining in the solution when 10g of solid AgNO3 is added to 50 ml of 1x10-2 M NaCl solution.

new neutrich high school
what is the independent and dependent variable if in every 29 minutes jogging burns 200 calories?

Probability
1) lambda 3) lambda + mu 4) 1/mu Number 5 I don't have the answer

Math
Indigo Industrial, Inc. is trying to determine which, if any, of five different projects it should undertake. Indigo Industrial has a 8.25% required rate of return on projects that it undertakes. The projected cash flows for each of the projects are given in the table below: ...

Finance
Capital Budgeting Problems I. Indigo Industrial, Inc. is trying to determine which, if any, of five different projects it should undertake. Indigo Industrial has a 8.25% required rate of return on projects that it undertakes. The projected cash flows for each of the projects ...

probability
2) True

Probability
3a) 20/27 3b) 2/3 5) 1/9

probability
Hey Im trying to work out these questions, could you tell me how you obtained the aswers you got, to give me some light please for working out the others.

Algebra
What word told you to multiply 3 and pe and q and 2 instead of divide? and then why did you set them equal to each other?

Algebra
Also what kind of problem is this? a rate of change?

Algebra
On Monday, it took Helen 3 hours to do a page of science homework exercises. The next day she did the same number of exercises in 2 hours. If her average rate on Monday was p exercises per hour, what was her average rate the next day, in terms of p? I know that the answer is 3...

Math
How? Ann is painting a fence that is 8 1/4 times as wide as she is tall. If Ann is 5 1/2 feet tall, how many feet wide is the fence? I so confused???? Any help would be appreciated - Thank You

physics
Car A with a mass of 1250 kg, is traveling at 30 m/s to the east. Car B is a truck with a mass of 2000 kg, traveling to the west at 25 m/s. assume these two vehicles experience an inelastic collision but do not stick together, and car A goes off 10 m/s to the west. what will ...

physics
A cylinder is fitted with a piston that is connected to the bottom by a spring. The spring has a spring constant of k = 3600 N/m. The cylinder is open to air at the top and is frictionless. The radius of the cylinder is 25 mm and the piston has negligible mass. The air beneath...

math
A rectangular plot of land is to be seeded with grass if the plot is 22m X 28m and a 1kg bag of seed is needed for 85m^ of land how many bags of seeds are needed?

Computer
How do you solve this algorithm problem? Suppose that you are given a sequence of n elements to sort. The input sequence consists of n/k subsequences, each containing k elements. The elements in a given subsequence are all smaller than the elements in the succeeding ...

Statistics
Which of the following is not a source of caution in regression analysis between two variables? A) non-linear form. B) linear form. C) a lurking variable. D) an outlier. E) extrapolation. E?

Statistics
A golf ball is dropped from 15 different heights (in inches) and the height of the bounce is recorded (in inches.) The regression analysis gives the model y-hat = -0.4 + 0.70 (drop height) where y-hat is the predicted bounce height of the golf ball. A golf ball dropped from 71...

Math
A ⊆ B. Prove P(A|B)>= P(A)

math
a rectangular mosaic is made up of exactly 12 square tiles that have an area of 9 square inches each. If the width of the mosaic is 9 inches, what is the perimeter of the mosaic in inches

chemistry
1. 1,6,3,2

physics
A faint sound with an intensity of 10 -9 W/m2 is measured by an intensity-level meter. What will the reading be in dB?

chemistry
what is the change in temperature if 24g of water at 50 degrees C absorbs 985j of heat energy

Math
a 55 kg skateboarder on a 3 kg board starts coasting on level ground at 8 m/sec. Let k=3.2 kg/sec. About how far will the skater coast before reaching a complete stop?

Math
with x = hours at first job and y = hours at the second job y <= 25 - x which is the amount of hours you can work at the same time, y >= (150/8)- (5/8)x is the amount of money you want to make if you graph both of these equations, you can find the range you should use.

Chemistry
How do the following solutions show the properties of a buffer? 1) 50 ml 0.10 M NH3 + 50 ml 0.10 M NH4NO3 2) 10 ml solution #1 + 5 ml H2O + 1 ml 0.10 M HCl 3) 10 ml solution #1 + 6 ml 0.10 M HCl 4) 10 ml solution #1 + 5 ml H2O + 1 ml 0.10 M NaOH

Math
Principal 450.00 x interest rate 9.25 x compounded monthly x 4 years

math
the letters g and g stand for numbers. if g + 9=h + 9, what is true about g and h?

precalculus
A rectangular field is to be enclosed by a fence and divided into three equal rectangular parts by two other fences. find the maximum area that can be enclosed and separated in this way with 1200m of fencing.

Physics
I'd like to know when it is appropriate to use each formula. Im new to studying physics and its seems that there are certain situations when one formula leads to the answer, yet a derivative of that formula that should lead to the answer is incorrect. For example: the ...

math 6
write an expression in terms of x for the perimeter of an isosceles triangle with 2 sides of 6 cm and a third side of 2x cm.

chemistry
What is the pH of pure water in equilibrium with 1 atmosphere of carbon dioxide at 25˚C? (Hint, what does 1 atmosphere of CO2 mean?)

math
Never mind, I guess I misinterpreted the problem because the radius actually does change

math
Gravel is being dumped from a conveyor belt at a rate of 40 cubic feet per minute. It forms a pile in the shape of a right circular cone whose base diameter and height are always the same. How fast is the height of the pile increasing when the pile is 22 feet high? Here are ...

calculus
F(x)= ln (cos theta) f'(x)

Calculus
Find an equation of the tangent line to the curve at the given point y^2 = x^3 (2-x) (1,1)

C B B D A For connexus

Chemistry
For the oxidation of glucose ( C6H12O6 + 2O2---6H2O +6CO2), how many moles of O2 will it take to consume 6 moles of glucose. Can someone explain it?

Chemistry
The nuclide 96Nb decays by a first-order process with a rate constant of 2.96 × 10-2 h-1. How long will it take for 85% of the initial amount of 96Nb to be consumed? I believe it is 5.07 hrs...

Chemistry
In the first order, reaction A yields products, A=0.400M initially and 0.250M after 15.0 min. What is the value of the rate constant, k?

Science
let's assume there is a cup of boiling water at 100 degrees and lake water at 24 degrees, the regular water would have more thermal energy because of the thermal energy it is absorbing from the sun, but the boiling water requires more energy to be heated.

Chemistry
Is the bond in the molecular orbital energy level diagram of Li2 stable?

Chemistry
Why does I2 have a higher boiling point than F2? And why does NH3 have a higher boiling point than PH3?

Physics
A fire hose 10 cm in diameter delivers water at the rate of 23 kg/s. The hose terminates in a nozzle 3.1 cm in diameter. (a) What is the flow speed in the hose? (b) What is the flow speed in the nozzle?

science
what needs to go out of a cell

Physics Word Problem
using Snell's Law (sin(theta1)/sin(theta2) = v1/v2 where (theta1) is the angle of incidence and (theta2) is the angle of refration. The number V1/V2 is called the index of refraction. The index of refraction from air to water is 4/3. If a ray of light passes through the ...

Physics Word Problem
using Snell's Law (sin(theta1)/sin(theta2) = v1/v2 where (theta1) is the angle of incidence and (theta2) is the angle of refration. The number V1/V2 is called the index of refraction. The index of refraction from air to water is 4/3. If a ray of light passes through the ...

Calculus
use implicit differentiation to find dy/dx if x^3+y^3=6xy

Calculus
use implicit differentiation to find dy/dx if x^3+y^3=6xy

math
20miles

science
How do you know a television change electricity into light energy? What other form energy is produced?

science
Where in nature could you find a source of the same energy as that provided by batteries? explain

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