# Posts by dee

Total # Posts: 945

**MATH HELP!!!!!!!!**

i need the 3 numbers for the answer, how do i find that?

**MATH HELP!!!!!!!!**

| 3 2 7 | x1 | | 46 | | -2 1 4 | x2 | = | 12 | | 6 -5 8 | x3 | | 60 | (b). Solve the system using the inverse of the coefficient matrix. (x1, x2, x3) = (________)

**physics**

An electric heater used to boil small amounts of water consists of a 25-Ω coil that is immersed directly in the water. It operates from a 60-V socket. How much time is required for this heater to raise the temperature of 0.50 kg of water from 29° C to the normal ...

**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

**Calculus - Optimization**

Don't have an answer. Just need to know how the calculations are done.

**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.