# Posts by dEE

Total # Posts: 938

**physics**

A tungsten wire has a radius of 0.077 mm and is heated from 20.0 to 1205 °C. The temperature coefficient of resistivity is α = 4.5 10-3 (C°)−1. When 110 V is applied across the ends of the hot wire, a current of 1.3 A is produced. How long is the wire? ...

**Business Math**

Convert the following mixed number to an improper fraction: 12 3/4

**college math HELP!!!!!**

i need to find equilibrium price using these two equations: P= -(1/25)x+190 P= (1/75)x+70 the equilibrium quantity is: 2250 units the equilibrium price is: ______?

**math HELP!!**

The quantity demanded x each month of Russo Espresso Makers is 250 when the unit price p is $180; the quantity demanded each month is 1000 when the unit price is $150. The suppliers will market 750 espresso makers if the unit price is $80. At a unit price of $90, they are ...

**college math HELP!!!!!**

The quantity demanded x each month of Russo Espresso Makers is 250 when the unit price p is $180; the quantity demanded each month is 1000 when the unit price is $150. The suppliers will market 750 espresso makers if the unit price is $80. At a unit price of $90, they are ...

**college finite math**

The quantity demanded x each month of Russo Espresso Makers is 250 when the unit price p is $180; the quantity demanded each month is 1000 when the unit price is $150. The suppliers will market 750 espresso makers if the unit price is $80. At a unit price of $90, they are ...

**college finite math**

A product may be made using Machine I or Machine II. The manufacturer estimates that the monthly fixed costs of using Machine I are $17,000, whereas the monthly fixed costs of using Machine II are $14,000. The variable costs of manufacturing 1 unit of the product using Machine...

**college finite math**

A division of a company produces "Personal Income Tax" diaries. Each diary sells for $6. The monthly fixed costs incurred by the division are $30,000, and the variable cost of producing each diary is $1. (a) Find the break-even point for the division. (x, y) = (6000...

**college finite math**

Cowling's Rule is a method for calculating pediatric drug dosages. If a denotes the adult dosage (in milligrams) and if t is the child's age (in years), then the child's dosage is given by D(t) = (t + 1/24)a (a) Show that D is a linear function of t. Hint: Think of...

**college finite math**

Cowling's Rule is a method for calculating pediatric drug dosages. If a denotes the adult dosage (in milligrams) and if t is the child's age (in years), then the child's dosage is given by D(t) = (t + 1/24)a (a) Show that D is a linear function of t. Hint: Think of...

**college finite math**

For wages less than the maximum taxable wage base, Social Security contributions (including those for Medicare) by employees are 7.65% of the employee's wages.† (a) Find an equation that expresses the relationship between the wages earned (x) and the Social Security ...

**Physics**

In a vacuum, two particles have charges of q1 and q2, where q1 = +3.7 µC. They are separated by a distance of 0.22 m, and particle 1 experiences an attractive force of 3.5 N. What is q2 (magnitude and sign)?

**english**

What part of speech is coursework?

**college Algebra**

Write the system as a matrix and solve it by Gauss-Jordan elimination. (If the system is inconsistent, enter INCONSISTENT. If the system has infinitely many solutions, show a general solution in terms of x, y, or z.) x + 2y − z = 5 2x − y + z = 2 3x − 4y + 3z...

**college Algebra**

Use matrix methods to solve the problem. To use space effectively, librarians like to fill shelves completely. One 105-inch shelf can hold 3 dictionaries, 5 atlases, and 1 thesaurus; or 6 dictionaries and 2 thesauruses; or 2 dictionaries, 4 atlases, and 3 thesauruses. How wide...

**college Algebra**

thank you

**college Algebra**

Use matrix methods to solve the problem. 120,000 gallons of fuel are to be divided between two airlines. Triple A Airways requires three times as much as Unity Air. How much fuel should be allocated to Triple A? ______ gal

**college Algebra**

i have no clue why its not working... i tried: 0,0,0 9,9,9 INCONSISTENT

**college Algebra**

its saying its wrong? :/

**college Algebra**

i think you used the wrong one for the third line... x+z=18 y+z=18 x-z=0

**college Algebra**

the answer didn't work...

**college Algebra**

Solve the system, if possible. (If the system is inconsistent, enter INCONSISTENT. If the system is dependent, enter a general solution in terms of x, y, or z.) x + y = 18 y + z = 18 x − z = 0

**college Algebra**

Solve the system, if possible. (If the system is inconsistent, enter INCONSISTENT. If the system is dependent, enter a general solution in terms of x, y, or z.) x + y + z = 7 2x + y + z = 14 x + 2y + 3z = 2

**College Algebra**

thank you, big help

**College Algebra**

Use a system of equations to solve the problem. A rectangular picture frame has a perimeter of 2,200 centimeters and a width that is 300 centimeters less than its length. Find the area of the picture. _____ cm2

**math**

12-4=8 8-4=4 4-4=0

**Physics**

A 0.125 kg meter stick is rotating (as shown to the right) in a horizontal plane about an axis through its center at 3.45 rad/s. a) Find the rotational inertia of this stick. At one of its ends, find its b) speed and c) centripetal acceleration. If this stick comes to rest in ...

**Algebra**

Thanks, Steve. I was having a mental block on this one and knew it was easy! I appreciate your help.

**Algebra**

This homework question was removed due to a copyright claim submitted by the National Network of Digital Schools Management Foundation (NNDS).

**algebra 1**

Each of the values in your table shows an x value and a corresponding y value. So, your ordered pairs are: {(4,3), (2,5), (2,2), (3,5), (1,1)} Graph them. The domain is {1,2,3,4} or the x values in numerical order and not listed more than once. The range is {1,2,3,5} or the y ...

**algebra**

that's exactly what I got but it keeps saying it is wrong.

**algebra**

find all roots of the polynomial equation. x^5+3x^4-2x^3-14x^2-15x-5=0.

**algebra**

thank you soooo much!!!

**algebra**

a hot-air balloon is tethered to the ground and only moves up and down. You and a friend take a ride on the balloon for approximately 25 minutes. On this particular ride the velocity of the balloon, v(t) in feet per minute, as a function of time, t in minutes, is represented ...

**algebra**

Help me factor x^2 -2x - 4 = 0 and 3x^2 + x + 3 = 0.

**college algebra**

A partial solution set is given for the polynomial equation. Find the complete solution set. (Enter your answers as a comma-separated list.) x^3 + 3x^2 − 14x − 20 = 0; {−5}

**college algebra**

Use long division to perform the division. (Express your answer as quotient + remainder/divisor.) (x^4 + 7x^3 − 2x^2 + x − 1) / (x − 1)

**college algebra**

Solve the exponential equation using logarithms. Give the answer in decimal form, rounding to four decimal places. (Enter your answers as a comma-separated list.) 4^(x − 3) = 3^(2x) x = _____

**college algebra**

Use a calculator to help solve the problem. An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 40% more of the substance? (Round your answer to one decimal place.) ____hr

**college algebra**

not sure how to find the t, tried using the log approach but can't get the right answer.

**college algebra**

An isotope of lead, 201Pb, has a half-life of 8.4 hours. How many hours ago was there 40% more of the substance? (Round your answer to one decimal place.) ____hr

**college algebra**

no it looks more like this: 4^(x-3)=3^2x

**college algebra**

Solve the exponential equation using logarithms. Give the answer in decimal form, rounding to four decimal places. (Enter your answers as a comma-separated list.) 4x − 3 = 32x x = _____

**college algebra**

In 4 years, 30% of a radioactive element decays. Find its half-life. (Round your answer to one decimal place.) _____ yr

**college algebra**

thank you

**college algebra**

Use a calculator to find y to four decimal places, if possible. (If an answer is undefined, enter UNDEFINED.) ln y = log 9

**college algebra**

Use a calculator to find y to four decimal places, if possible. (If an answer is undefined, enter UNDEFINED.) ln y = −0.35

**college Algebra**

Use a calculator to find y to four decimal places, if possible. (If an answer is undefined, enter UNDEFINED.) ln y = −0.35

**college Algebra**

Use a calculator to find y to four decimal places, if possible. (If an answer is undefined, enter UNDEFINED.) ln y = log 9

**college Algebra**

Thank you, big help!

**college Algebra**

Use a calculator to help solve the problem. The life expectancy of white females can be estimated by using the function = 78.5(1.001)x, where x is the current age. Find the life expectancy of a white female who is currently 50 years old. Give the answer to the nearest tenth. L...

**college algebra**

i did that and it is not working. i get 0.0348

**college algebra**

Use a calculator to help solve the problem. The intensity I of light (in lumens) at a distance x meters below the surface is given by I = I0 k x, where I0 is the intensity at the surface and k depends on the clarity of the water. At one location in the Atlantic ...

**College Algebra**

thank you Reiny and Bob

**College Algebra**

Use a calculator to help solve the problem. One isotope of holmium, 162Ho, has a half life of 22 minutes. The half-life of a second isotope, 164Ho, is 37 minutes. Starting with a sample containing equal amounts, find the ratio of the amounts of 162Ho to 164Ho after two hours...

**Finance**

P5. A thirty U.S. Treasury bond has a 4.0 percent interest rate. In contrast, a ten-year Treasury bond has an interest rate of 2.5 percent. A maturity risk premium is estimated to be .2 percentage points for the longer maturity bond. Investors expect inflation to average 1.5 ...

**Statistics Math**

with the reliability coefficent of 0.81 using the classical theory we would interpret that the

**College Algebra**

I think the question is asking what she would pay at the end of the year. I tried $159.93 and it was not correct.

**College Algebra**

A bank credit card charges interest at the rate of 23% per year, compounded monthly. If a senior in college charges $1,700 to pay for college expenses, and intends to pay it in one year, what will she have to pay?

**math**

if a 50ft flag pole cast a 10ft shadow how far is it from the end of the shadow to the top of the pole

**college algebra**

graph the following: 7x + 6y = 42 (-6x+42)\(7)

**college algebra**

graph the following: (5/4)x-4 (4x+16)/(5)

**college algebra**

Thanks, I finally got it.

**college algebra**

now all I need help on is finding the domain of the f(f) that you just posted.

**college algebra**

no sir, it asks for f(f).

**college algebra**

thank you so much steve!! could you help me with this one? Let f(x) = square root (x + 2) and g(x) = x^2 − 2. Determine the domain of the composite function. (Enter your answer using interval notation.) f compose f _____? and Find the composite function. (f compose f)(x...

**college algebra**

find the domain of (x-2)/(-3x+7)

**college algebra**

Let f(x) = 1/x − 2 and g(x) = 1/x − 3 . Determine the domain of the composite function. (Enter your answer using interval notation.) g compose f _____? & Find the composite function. (g compose f)(x) = _____?

**college algebra**

Let f(x) = square root (x + 2) and g(x) = x^2 − 2. Determine the domain of the composite function. (Enter your answer using interval notation.) f compose f ______? & Find the composite function. (f compose f)(x) = _____?

**college algebra**

(Enter your answer using interval notation.) f compose f

**college algebra**

Let f(x) = x + 2 and g(x) = x2 − 2. Determine the domain of the composite function.

**college algebra**

Thank you so much.

**college algebra**

what is the domain of (square root of x) +7?

**college algebra**

Thank you Steve, that was a big help.

**college algebra**

the following rational function gives the number of days it would take two construction crews, working together, to frame a house that crew 1 (working alone)could complete in t days and crew 2 (working alone) could complete in t+3 days. f(t)=(t^2+3t)/(2t+3). (a) if crew 1 ...

**college algebra**

Need help in finding all vertical, horizontal, and slant asymptotes, x- and y-intercepts, and symmetries of f(x)=(x-3)/(x-4)

**Chemistry**

What is the relationship of the concentration of H3O and of OH

**social studies**

men from higher social classes in------ cultures tend to have low levels of conformity, more self-direction, and have greater intellectual flexibility than did men from lower social classes A) collectivist B) individualist C) interdependent D) all My choice is C but Im a ...

**physics**

a 100g mass of cookie dough hits inelastically with a 300g mass of cookie dough and they stick. the 100 g mass was moving to the right at 40 m/s and the 300g mas was moving to the left at 5 m/s. what is the final velocity of the massive cookie dough ball? what fraction of ...

**social studies**

thank you very much!

**social studies**

I am guessing this one, because I can't find the answer on my book. Would it be D.

**social studies**

people in countries with tend to be happier A) high incomes B) low incomes C) more civil liberties D) high incomes and more civil liberties My answer is B.

**social studies**

daydreaming can be an expression of: A) repression B) denial C) sublimation D) projection My answer is D

**social studies**

thank you for the eye opener:)

**social studies**

then the answer is B, because personality its not heritable and def. not C

**social studies**

all personality variables are: A) highly heritable B) unconscious C) theoretical constructs D) easily assessed with questionnaries My asnwer is D

**aed**

thank you

**aed**

I need an answer

**aed**

determine the potential impact of socioeconomic status on education in the following areas: teacher expectatations, student tracking, equal representation in the curriculum, and financial support for schools

**math**

a rectangular swimming pool 20 feet long and 10 feet wide,is enclosed by a wooden deck that is 3 feet wide. What is the area of the deck? How much fence is required to enclose the deck?

**math**

a rectangular swimming pool 20 feet long and 10 feet wide,is enclosed by a wooden deck that is 3 feet wide. What is the area of the deck? How much fence is required to enclose the deck?

**Algebra**

Express the relationship 20 < C < 30 in terms of F, where F = 9/5C + 32. _____________ < F < _____________

**Algebra**

the cost of renting a rototiller is $16.50 for the first hour and $10.95 for each additional hour. How long can a person have the rototiller if the cost must be less than $55.00?

**algebra**

a student write that an=3n+1 is a explicit formula for the sequence 1,4,7,10.explain the error and write the correct explicit formula for the sequence.

**college algebra**

The county news earns a profit of $20 per year for each of its 3000 subscribers. Management projects that the profit per subscriber would increase by $0.01 for each additional subscriber over the current 3,000. How many subscribers are needed to bring a total profit of $113,100?

**college algebra**

no, I copied the question just as it is, there is 2 answers, the $10,000 is the smaller amount he invested, there should also be a larger amount.

**college algebra**

Scott and Laura have both invested some money. Scott invested $2500 more than Laura and at a 3% higher interest rate. If Scott received $900 annual interest and Laura received $450, how much did Scott invest?

**college algebra**

a large rectangular movie screen in an IMAX theater has an area of 8624 square feet. Find the dimensions of the screen if it is 10 feet longer than it is wide.

**CHEM**

joules to melt a 525g ice cube at 0∘C and to warm the liquid

**Algebra**

Kevin stuffs shrimp in his job as a seafood chef. He can stuff 1200 shrimp in 4 hours. When his sister helps him, they can stuff 1200 shrimp in 3 hours. If kevin gets sick, how long will it take his sister to stuff 600 shrimp?