Saturday

February 25, 2017
Total # Posts: 105,623

**Math**

Janet Foster bought a computer and printer at Computerland. The printer had a $620 list price with a $100 trade discount and 2/10, n/30 terms. The computer had a $2,200 list price with a 25% trade discount but no cash discount. On the computer, Computerland offered Janet the ...

*February 24, 2017*

**Chemistry **

sulfuric acid can be prepared by a multistep process summarized as: 2 SO2 + O2 + 2 H2O--> 2 H2SO4 What mass of sulfuric acid could be produced daily by a process using 38 kg per day of sulfuric dioxide with a 70% conversion efficiency ("yield"), assuming that ...

*February 24, 2017*

**Chemistry **

How many grams of a solid mixture containing strontium chloride would one need to make 558 mL of a 0.100 M strontium chloride solution, if the solid mixture contains 58.6% strontium chloride by weight

*February 24, 2017*

**Algebra**

What is the solution and magnitude of the following problem: (x^4)-1=0 (x^3)+1=0 (x^3)-1=0 (x^6)-1=0 (x^6)+1=0

*February 24, 2017*

**Chemistry**

the correct answer is 3.375x10^-22 J. But i don't know how to get this answer correctly.

*February 24, 2017*

**Chemistry **

High-pressure sodium vapor lamps are used in street lighting. The two brightest lines in the sodium spectrum are at 589.00 and 589.59 nm. What is the diffrence in energy per photon of the radiations corresponding to these two lines?

*February 24, 2017*

**Calculus**

Find the derivative of the integral from x^3 to 5 of cosk/(k^2+2). My answer is ((-cos(x^3)(3x^2))/(x^6+2).

*February 24, 2017*

**Math**

Given: f(x) = 8 - 4x A. Find f(-2) B. Find x, when f(x) = 8 C. Graph the function. D. State the domain and range of the function. E. Use the graph to find x, when f(x) = 0. Show details on the graph. F. Use the graph to find f(x) when x = 3. Show details on the graph.

*February 24, 2017*

**Calculus**

Find the derivative of the integral from x to 6 of ln(1 + t^2). My answer is -ln(1+x^2).

*February 24, 2017*

**ELA AND HELP!!!!!!**

Hint: Is there one word that can be replaced by a person's name?

*February 24, 2017*

**Math **

Ed’s rental charges a flat fee of $5 plus $2 per hour to rent a pair of skates. A. Write an equation to model the cost of renting skates, y, for x hours. B. Graph the equation. Label the y-intercept. C. Use the graph to find the cost for renting the skates for 2 hours. ...

*February 24, 2017*

**English**

The title “Another Evening at the Club” is close in meaning to “Just Another Evening at the Club.” Given the events of the story, what is the significance of this meaning?

*February 24, 2017*

**math **

-3x 2 = 1/4 (2 raised to the power -3x = 1/4)

*February 24, 2017*

**American History**

Did the concept of race exist since the beginning of time?

*February 24, 2017*

**chemistry, science**

how many moles of he atoms are there in 0.02g of he?

*February 24, 2017*

**Math**

Given: f(x) = 8 - 4x A. Find f(-2) B. Find x, when f(x) = 8 C. Graph the function. D. State the domain and range of the function. E. Use the graph to find x, when f(x) = 0. Show details on the graph. F. Use the graph to find f(x) when x = 3. Show details on the graph.

*February 24, 2017*

**Math**

Given: f(X)= 8-4x A. Find f(-2) B. Find x, when f(x)= 8 C. Graph the function. D. State the domain and range of the function. E. Use the graph to find x, when f(x) = 0 . Show details on the graph. F. Use the graph to find f(x)when x = 3. Show details on the graph.

*February 23, 2017*

**Math**

Consider the sequence t1=1, t2=-1, and that tn-tn-2(n-3)/(n-1), where n>2. Find the value of t1998. (1998 is the term, so is n, t1 and t2)

*February 23, 2017*

**math**

there are 64 seventh graders at a middle school. This is 32% of the students at the school. The sixth graders comprise 38% of the school how many sixth graders attend the middle school

*February 23, 2017*

**math**

Maya has 4 1/2m of ribbon. She uses 1 3/4m to wrap a present and 1/3m to make a bow. How much ribbon is left?

*February 23, 2017*

**Ethics**

The World Medical Association (WMA) states that FGM does not violate the principles of medical ethics, if FGM is part of the cultural tradition where the physician is practicing medicine. True False I say false

*February 23, 2017*

**Math**

x y -2 -5 0 -1 1 1 2 3 A. Graph the ordered pairs. B. Is the function linear? Explain. C. Write a rule for the ordered pairs in terms of x and y. D. What is the value of y when x = 10?

*February 23, 2017*

**math**

geez - impatient much?

*February 23, 2017*

**Math**

5 thousand 22 tens and 9 ones equals what number

*February 23, 2017*

**Algebra**

Give the interval(s) on which the function f is positive if f is defined as: f(x)=x(5?x)(2x?3)

*February 23, 2017*

**physics**

A ball moving at a velocity of 10 meters/second has a momentum of 8.0 kilogram meters/second. What is its mass?

*February 23, 2017*

**Physics**

11469.9

*February 23, 2017*

**Social Studies**

Also Among the first laws passed by FDR was the Truth-in-Securities Act. How did it support his New Deal goals? A. The law’s purpose was to make sure farmers’ investments were safe. B. The law’s goal was to prevent another economic crash. C. The law was focused ...

*February 23, 2017*

**Social Studies**

Which of the following best summarizes Hoover’s and Roosevelt’s policies? A. Hoover was most concerned about stabilizing the banks, while Roosevelt chose to provide jobs. B. Hoover believed in providing public works and welfare, while Roosevelt wanted the people to ...

*February 23, 2017*

**Algebra **

Let f (x)= (x^2 + 3x - 4) and g(x)= (x + 4) a. Find f*g and state the domain b. Find f/g and state the domain

*February 23, 2017*

**Algebra **

Use the coordinates of the two points that show male life expectancies for 1980 and 2000 to write a linear function that models life expectancy. E (x), for men born in this community x years after 1960 Coordinates are 1960-66.8 1970-67.5 1980-69.9 1990-70.5 2000-74.1 2004-75.2

*February 23, 2017*

**Math - Derivatives**

Or how do I find the formula for this?

*February 23, 2017*

**Math - Derivatives**

Find the nth derivative of y=2x/(1-x^2) (Hint: Consider -[(1/(x-1))+(1/(x+1))].)

*February 23, 2017*

**Calculus**

Evaluate the integral. 1/2 integral e^(t/2) (I'm not sure what the 1/2 on the left of the integral symbol means.)

*February 23, 2017*

**Social Studies**

â€We took away their best lands; broke treaties, promises; tossed them the most nearly worthless scraps of a continent that had once been wholly theirs. But we did not liquidate their spirit. The vital spark which kept them alive was hardy." Based on the ...

*February 22, 2017*

**Math/Calculus**

Find the equation of the tangent line to the given equation at the indicated point a) y^2=cos(5x-3y) at ((2pi+3)/5, 1) b) x^2+x^2y+4=0 at (2,-2)

*February 22, 2017*

**Biology**

A life cycle in which organisms switch back and forth between diplid and haplid stages?

*February 22, 2017*

**Math**

Use the table of values. x y -2 -5 0 -1 1 1 2 3 A. Graph the ordered pairs. B. Is the function linear? Explain. C. Write a rule for the ordered pairs in terms of x and y. D. What is the value of y when x = 10?

*February 22, 2017*

**Math**

Find a formula for D^n_x(1/x). (The n is superscript and the x is subscript)

*February 22, 2017*

**Science**

How do the spaces between particles affect viscosity?

*February 22, 2017*

**Math**

Felisa will carpet her rectangular living room shown below. The carpet she selected is sold by the square yard, at a cost of $32 per square yard. To the nearest dollar, how much will it cost to carpet the living room?

*February 22, 2017*

**Math**

You have $80 and your brother has $275 dollars. You save $10 of your allowance each week. Your brother spends his allowance plus $15 each week. A. Write an equation to model this. B. How long before you have as much money as your brother? C. How much have you saved when you ...

*February 22, 2017*

**Algebra**

Insert five geometric means between 0.125 and 8. I know one set is 0.25, 0.5, 1, 2, 4 What would be the other set?

*February 22, 2017*

**Algebra**

2. You have $80 and your brother has $275 dollars. You save $10 of your allowance each week. Your brother spends his allowance plus $15 each week. A. Write an equation to model this. B. How long before you have as much money as your brother? C. How much have you saved when ...

*February 22, 2017*

**math**

can i get some real help

*February 22, 2017*

**Math**

if it isn't a rectangular pyramid what is it?

*February 22, 2017*

**Math**

why do you disagree? what do you think it is neil?

*February 22, 2017*

**Math**

That would be the rectangular pyramid.

*February 22, 2017*

**Math**

thank you sooo much you are a great person

*February 22, 2017*

**Math**

The product of (4z2 + 7z – 8) and (–z + 3) is –4z3 + xz2 + yz – 24. What is the value of x? What is the value of y?

*February 22, 2017*

**History**

Please check my answers. Question 1(Multiple Choice Worth 5 points) [06.06 MC] Which answer best describes how the Supreme Court viewed Maryland's taxing of the national bank created after the War of 1812? The Supreme Court decided Maryland was within its rights as a state...

*February 22, 2017*

**ss**

9. The economies of the United States and Canada are (2 points) very different. strongly linked. dependent on tourism. exactly the same.

*February 22, 2017*

**Educational Technology**

This anonymous is Damon by the way :)

*February 22, 2017*

**Educational Technology**

Otherwise even the technical literature would be flooded with alternative facts.

*February 22, 2017*

**Educational Technology**

why is it important to take responsibility for your online publication (1 point)

*February 22, 2017*

**science**

By the way most oil floats on water :)

*February 22, 2017*

**science**

It has mass of 100 g It lost 25 g in water so its volume is 25 cm^3 It lost 30 g in oil so the mass of oil displaced by its 25 cm^3 volume was 30 g so density of the oil = 30 g/25cm^3 = 1.2 g/cm^3 = 1.2 times water density.

*February 22, 2017*

**Math**

has read 1/5 + 3/5 = 4/5 must read 5/5 - 4/5 = 1/5

*February 22, 2017*

**Mayh**

Martin used m Omar used .5m-5 total = m + .5 m - 5 = 1.5 m-5

*February 22, 2017*

**chemistry**

thank you so much you are a great help have a nice day. you are an amazing and smart person!

*February 22, 2017*

**chemistry**

P V = n R T V, T and R are the same for each so n, the number of mols is proportional to P total pressure = 3.5 + 2.8 + .25 + .15 = 6.7 so for example mol fraction of N2 = 3.5/6.7 = .522

*February 22, 2017*

**chemistry**

Four gases were combined in a gas cylinder with these partial pressures: 3.5 atm N2, 2.8 atm O2, 0.25 atm Ar, and 0.15 atm He.What is the mole fraction of N2 in the mixture?

*February 22, 2017*

**maths**

total length = 15+3 = 18 total width = 9+3 = 12 so path area = 12*18 - 9*15

*February 22, 2017*

**Physics**

v = -9.81 (3.6) d = (1/2)g t^2 = 4.9(3.6)^2

*February 22, 2017*

**Physics**

v = Vi - 9.81 t at top v = 0 0 = 49 - 9.81 t t = 49/9.81 h = 49 t - 4.9 t^2

*February 22, 2017*

**Vocabulary**

Are you doing online school or is it just the one site you do at school cause i am doing online school and it sucks my teachers make a lot of errors. but i get to have an early summer cause i finish all my work at a faster pace. woot woot summmmmmmmer a month early you should ...

*February 22, 2017*

**biology **

if you have 1.0*10^9 molecule in tube and perform a 10^-7 dilution, how many molecule will in the new tube?

*February 22, 2017*

**biology**

if you want to make 50 ml of a 1x TAE solution fro a 50X stock, how would you prepare it?

*February 22, 2017*

**Science**

How are the primary pigments related to the primary colors? The primary pigments are: A. Complementary to the primary colors B. Associated with the primary colors C. Unrelated to the primary colors

*February 22, 2017*

**Algebra**

12%=0.12 then you multiply $1599.99 by 0.12 and you get 191.9988 then you round and get $192 hope this is correct its been a couple years since alg.

*February 22, 2017*

**Algebra**

Jameston High School has 2020 students. Its enrollment has been decreasing at a rate of 125 students per year. Townsville High School has 1075 students. Its enrollment has been increasing at a rate of 80 students per year. Assuming the enrollment rates continue: A. Write an ...

*February 22, 2017*

**math**

Of the following fractions: 9/19, 5/11, 7/15, and 11/23, which is the largest?

*February 21, 2017*

**Calculus**

What is y=-2/7x-1 in standard form?

*February 21, 2017*

**Calculus**

What is y=-18x+13 in standard form?

*February 21, 2017*

**Math**

A bicycle that usually sells for $230 is on sale for 15% off. Find the sale price. Is this correct 230/25=9.2 230-9.2=220.8

*February 21, 2017*

**Statistics **

Researchers recruited 20 volunteers- 8 men and 12 men omen- to take part in an experiment

*February 21, 2017*

**Math/velocity**

just kidding, I figured it out! It's -4, 0, and 4

*February 21, 2017*

**Math/velocity**

At time t seconds, the center of a bobbing cork is y=4sint centimeters above (or below) water level. What is the velocity of the cork at t = 0, ?/2, ?

*February 21, 2017*

**Math derivatives**

Let f(2)=3, g(2)=4, f'(2)=5, g'(2)=6, f'(3)=7, g'(3)=8, etc. find (f?g)?(2)

*February 21, 2017*

**Math**

A line segment has one endpoint of (-3,2) and an undefined slope. Find the coordinates of another possible endpoint.

*February 21, 2017*

**world**

The shares of a company

*February 21, 2017*

**Math**

A line segment has one endpoint of A (2, -1) and a slope of 3/4. Find the coordinates of another possible endpoint B.

*February 21, 2017*

**Algebra 1**

Oh sorry about that, the slope is 2/3 and also thanks for the help.

*February 21, 2017*

**Algebra 1**

1. yes 4/3 2. slope = -2 all right 3. You did not say what the slope is but the only choice with y intercept of 9 is C. The y axis intercept is the value of y when x=0

*February 21, 2017*

**Algebra 1**

1. Find the slope of a line that passes through (–2, –3), and (1, 1). A. 1/3 B. 1 C. 2 D. 4/3** 2. For the equation –4y = 8x, what is the constant of variation? A. -4 B. -2** C. 1 D. 2 3. What is an equation for the line with slope and y-intercept 9? A. y = 2/3x...

*February 21, 2017*

**Algebra 1**

Thanks for the help

*February 21, 2017*

**Algebra 1**

1. yes, y = 3 x so y = 30 when x = 10 2. slope = m = (1+3)/(3-1) = 2 so y = 2 x + b put a point in 1 = 2*3 + b b = -5 so y = 2 x - 5 agree

*February 21, 2017*

**Algebra 1**

1. Suppose y varies directly with x, and y = 24 when x = 8. What is the value of y when x = 10? A. 10 B. 30** C. 80 D. 240 2. What is an equation in slope-intercept form for the line that passes through the points (1, –3) and (3, 1)? A. y = 3x + 1 B. y = x – 3 C. y...

*February 21, 2017*

**Science**

potential energy + kinetic energy = constant at top, Pe = m g H and Ke = 0 on the way down (1/2) m v^2 + m g h = that original m g H

*February 21, 2017*

**math**

2(b+3b)=40 b = 5 so 5 and 15

*February 21, 2017*

**Math**

30*60 = 1800 seconds * 4 m/s = 4*1800 meters 2 pi r = 200 pi meters circumference 4 *1800/200 pi = 36/pi= 11.459 circles = 11 circles + .459 circle .459 * 360 = 165 degrees x = 100 cos 165 = -96.6 y = 100 sin 165 = +25.9

*February 21, 2017*

**language arts: plz help**

How mature Ms. Sue deleting my comment!!!! Such An Adult!!!!

*February 21, 2017*

**Math**

A recipe that makes eight servings calls for 2 cups of milk how many cups of milk will be needed for 36 servings

*February 21, 2017*

**physics**

work = pulling force in direction of motion * distance like period, the friction and all are irrelevant. work = 161 cos 35 * 13.5 If there are more parts like how fast does it go or something, the rest matters, but that is all you need to know for the question you asked.

*February 21, 2017*

**physics**

mass does not matter, call it m normal force = m g cos 44 max friction force up slope = .27 m g cos 44 gravity force down slope = m g sin 44 so m g sin 44 - .27 m g cos 44 = m a (sin 44 - .27 cos 44) 9.81 = a

*February 21, 2017*

**Hala -- Physics**

Hala - acceleration = total change in velocity/time, not average a = 10 /2 = 5 m/s^2 what is in your mind I think is total distance = average speed *time

*February 21, 2017*

**Math**

2 x + 5 x = 63 7 x = 63 x = 9 2x = 18 5x = 45 ================== add to check 18 + 45 = 63, whew !

*February 21, 2017*

**Differential equation, calculus**

dt/dr = k/r^2 dt = k dr/r^2 try t = k (-1/r) + c I do not know where you got the other.

*February 21, 2017*

**physics**

Ac = 1.5 g = approximately 15 m/s^2 Ac = omega^2 r so omega^2 = 15/8 omega = 1.37 radiaans/second 2 pi radian /rev so .218 revs/sec times 60 s/min = 13 revs/min

*February 21, 2017*

**no idea**

Need better description of how boxes interact. (one on top of other? one hanging vertically from pulley? whatever)

*February 21, 2017*