Wednesday

April 16, 2014

April 16, 2014

Post a New Question | Current Questions

**Algebra 2**

A grocer mixes x kg of Grade A and Y kg of Grade B nuts to get 60 kg of mixed nuts. Write and equation involving x and y to represent this information. The grocer sells all the mixed nuts at 9.00 per kg. He receives the same amount of money as when he sells the Grade A nuts ...
*Thursday, December 5, 2013 at 8:45pm*

**finance**

My interpretation of the wording first year = 47500 2nd year = 47500(1.23) third year = 47500(1.23)^2 fourth year = 47500(1.23)^2 (1.12) = .....
*Wednesday, December 4, 2013 at 8:55am*

**MATH**

math that comes before calculus, usually 2nd year algebra and trigonometry. Geometry comes into play as well.
*Wednesday, December 4, 2013 at 6:17am*

**geometry**

let the outer segment of the 2nd secant be x then the inner segment is 28-x 8/6 = x/(28-x) 6x = 224 - 8x 14x = 224 x = 16
*Tuesday, December 3, 2013 at 4:30pm*

**Math**

after 1st breath , diameter = 5cm after 2nd breath , diamieter = 1.2(5) = after 3rd breath, diameter = 5(1.2)^2=
*Tuesday, December 3, 2013 at 1:19am*

**2nd question - calculus area between three curves**

nice symmetry, should be easy to see that the x-intercepts are (c,0) and (-c,0) for both so just double the area from 0 to c area = 2∫(c^2 - x^2 - (x^2 - c^2)) dx from 0 to c = 2∫(2c^2 - 2x^2) dx from 0 to c = 2[2c^2 x - (2/3)x^3] from 0 to c = 2(c^3 - (2/3)c^3] = ...
*Monday, December 2, 2013 at 2:39pm*

**5th grade math**

4th Grade: 9 Left-handed students. Total = 3 * 9 = 27 Students. 9/27 = 1/3 Are left-handed. 5th Grade: 7 Left-handed students. Total = 30-2 = 28 Sudents. 7/28 = 1/4 Are left-handed. 6th Grade: 6 Left-handed students. Total = 27+3 = 30 Students. 6/30 = 1/5 Are left-handed. The ...
*Sunday, December 1, 2013 at 9:31pm*

**Algebra 1 (Reiny or Kuai)**

Using y = mx + b, first we need the slope m m = (8-6)/(7-(-7)) = 2/14 = 1/7 sofar: y = (1/7)x + b sub in (7,8) 8 = (1/7)(7) + b 8 = 1 + b 7 = b y = (1/7)x + 7 I usually check, by testing with the point that was not used in the substitution , in this case (-7,6) LS = 6 RS = (1/...
*Saturday, November 30, 2013 at 2:45pm*

**algerbra 2**

multiply the 2nd by 2 to get 4k-2 < 10 Now add the first, and we have -26 < 4k-2 < 10
*Friday, November 22, 2013 at 5:47pm*

**Math**

Eq1: x + 2y = 10. m1 = -A/B = -1/2 The slope of the 2nd line = the negative reciprocal of m1: m2 = -(-2/1) = 2. Y = mx + b Eq2: Y = 2x - 10 or 2x - y = 10
*Thursday, November 21, 2013 at 11:52am*

**Pre-Calculus**

since the line is perpendicular, their slopes are negative reciprocals of each other, that means, they must be OPPOSITE in sign so first slope = -3/2 2nd slope = +2/3 y-2 = (2/3)(x-4) 3y-6 = 2x-8 3y = 2x - 2 y = (2/3)x - 2/3
*Tuesday, November 19, 2013 at 10:43am*

**Math Help**

#2 is correct #3 solving your 2 equations: 1st times 2: 8b+6n=47 2nd times 3: 15b+6n=64.5 subtract them: 7b = 17.5 b = 2.5 sub back in ----> n = 4.5 necklace costs $4.50 and bracelet costs $2.50 so buying just one each = $7.00
*Tuesday, November 19, 2013 at 10:39am*

**Math 2 questions**

In #1, substitute x=3y+1 into 2nd equation in #2, substitute y=2x+4 into the 1st equation
*Tuesday, November 19, 2013 at 5:43am*

**4th Grade Math: Help Is Needed ASAP**

My son is in the fourth grade and is needing help with these math problems. Can someone please help him with these problems. 1. 2/3+2/9= 2. 3/5+3/10= 3. 5/12+1/3= 4. Find the sum of 1/6 and 1/12 5. Add 1/4 to the answer in Exercise 4. 6. What is the sum of 1/8, 1/4, and 3/8? 7...
*Monday, November 18, 2013 at 8:21pm*

**math**

Carlos was 5feet,8inches tall at the beginning of ninth grade. he grew 4 3/4inches during that school year and 2 1/4inches during follow the summer. how tall was Carlos at the beginning of tenth grade? Express his height in feet and inches.
*Monday, November 18, 2013 at 12:02pm*

**physics**

Two forces act on an object. The first force has a magnitude of 17.0 N and is oriented 68.0° counter-clockwise from the x axis, while the 2nd force has x- and y-components (-19.0 N, 16.5 N). Express the magnitude and direction of the net force.
*Thursday, November 14, 2013 at 10:38pm*

**Math--PLEASE HELP!!!**

10 cases for 1st draw, 10 for the 2nd, 10 for the third, 10 for the 4th prob = 1/10^4 = 1/10000 if ball is not returned prob = 1/(10*9*8*7) = 1/5040
*Thursday, November 14, 2013 at 10:27am*

**Math**

they both have length which is twice the width, so they are similar. comparing 1st to 2nd, width/width = length/length 44/35 = 88/70
*Wednesday, November 13, 2013 at 6:37pm*

**Math**

COMMON CORE? IT'S PART OF COMMON CORE, WHICH WILL ADVANCE ALL OUR KIDS TO NEXT GRADE LEVEL WEATHER OR NOT IF THEY PASS. If your kid is advanced they will be expected to maintain a certain percentage not based on their grade and if they don't they will be put in class ...
*Wednesday, November 13, 2013 at 5:19pm*

**ELA? Check answers!!**

Was there some text? That might have been helpful when posted. Anyways, Your first answer was right, and the 2nd answer depedns on the text. The third answer, I would say it is interrogative because you need to ask a question to monitor a person's comprehension So the ...
*Wednesday, November 13, 2013 at 11:26am*

**Beginner Spanish -Check my answers please**

Review the differences between SER and ESTAR that I did on the earlier post. 1. OK 2. OK 3. OK 4. First verb is correct but for the 2nd, notice the -ndo form which requires estar = está loviendo 5. OK Sra
*Tuesday, November 12, 2013 at 1:03pm*

**Chemistry**

No, I don't think is was useless to ask. And yes, I would have asked, also. And if I received a 2/25 on anything I would want to know what I did wrong. The teacher must be counting the assignment as a small fraction of the grade for you to still have an A. What to do? Your...
*Thursday, November 7, 2013 at 9:03pm*

**Poem: Annabel Lee by Edgar Allen Poe**

MONDAY November 4, 2013 SCHOOL SUBJECTS Art Business Computers English Foreign Languages Health Home Economics Math Music Physical Education Science Social Studies GRADE LEVELS Preschool Kindergarten Elementary School 1st Grade 2nd Grade 3rd Grade 4th Grade 5th Grade 6th ...
*Monday, November 4, 2013 at 4:52pm*

**Physics **

6) The relationship between force and acceleration is given by Newton’s 2nd Law: Fnet ;= ma. In this case this becomes: ...
*Wednesday, October 30, 2013 at 1:34am*

**biology**

Imagine that you collected your data above, threw away the gel, and re-ran PCR again on the same samples, but using a different set of primers. How will the 2nd gel differ from the first since you're using a different set of primers?
*Monday, October 28, 2013 at 11:32pm*

**Biology**

Imagine that you collected your data above, threw away the gel, and re-ran PCR again on the same samples, but using a different set of primers. How will the 2nd gel differ from the first since you're using a different set of primers?
*Monday, October 28, 2013 at 11:01pm*

**Physics**

A 20-kg child sits on a see saw on the playground, 3.0 m from the pivot. A 2nd child is seated on the other side of the pivot and 2.00 m from the pivot. The mass of the second child needed to lift the first child off the ground is
*Monday, October 28, 2013 at 4:17pm*

**algebra**

from the 1st: x = 7-2y into the 2nd: 6(7-2y) - 6y = 15 42 - 12y - 6y = 15 -18y = -27 y = 3/2 into x = 7-2y x = 7 - 3 = 4 x = 4, y = 3/2
*Sunday, October 27, 2013 at 1:14pm*

**Math**

you can find it one of two ways. the first is using the calculator which is the easiest or you can do it by hand. calculator: solve for y for both equations and then plug the first equation as y1 and the second equation as y2. then you do 2nd calc intersection (5) on the calc...
*Thursday, October 24, 2013 at 10:51pm*

**government**

http://en.wikipedia.org/wiki/New_Hampshire Read that 2nd paragraph carefully.
*Thursday, October 24, 2013 at 4:01pm*

**s.s**

no he was like he so sad that lincon died he also said dear father since he is a good leader lincon is like a 2nd father
*Tuesday, October 22, 2013 at 9:32pm*

**geometry easy**

Obviously the sides must be equal, so 9y + 45 = 2y + 25 Solve for y, sub back into the expression for the side to get its length. 2nd: let the short side be x then the longer side is 2x solve: x + x + 2x + 2x = 66
*Tuesday, October 22, 2013 at 9:17am*

**math**

Yes, isn't that what I did in my last reply ?? look at the right side of my 2nd last line or 3L/5 = 7 times 5 3L = 35 divide by 3 L = 35/3
*Monday, October 21, 2013 at 11:51pm*

**ALGEBRA HELP**

For a "good form" solution, you should include "=" signs in front of each new line 4x^2-2+8-3(4x^2-2)+(-x^2+3x-2) = 4x^2 -2+ 8 -12x^2 + 6 -x^2 + 3x -2 = 4x^2 -12x^2 - x^2 +3x -2+ 8+6 -2 = -9x^2 +3x +10 notice I also caught your error in the 2nd last and ...
*Monday, October 21, 2013 at 11:33pm*

**math 9**

change 2nd equation by dividing by 5 x = 1 - 5y sub into the 1st 3(1-5y) - 2y = 6 3 - 15y - 2y = 6 -17y = 3 y = -3/17 Without even going further, the only one that has that y value is C) I will leave it up to you to check that the x is correct by subbing my answer back into x...
*Sunday, October 20, 2013 at 10:33pm*

**maths**

The 1st(closest) car: X1 = Distance from tower. A1 = 60o = Angle between X1 and hyp. The 2nd car: X2 = Dist. bet. the 2 cars. X1+X2 = Dist. from 2nd car to tower. A2 = 30o = Angle bet. (X1+X2) and hyp. tan 60 = 50/X1 X1 = 50/tan 60 = 28.87 m. tan 30 = 50/(X1+X2) X1+X2 = 50/tan...
*Saturday, October 19, 2013 at 5:45pm*

**Math**

Assumptions: 1. ABCDE is also a pentagon 2. PR is the corresponding diagonal in the 2nd pentagon In that case, the areas of similar figures are proportional to the square of their sides (or their diagonals) PR^2/6^2 = 18/32 PR^2 = 648/32 = 81/4 PR = 9/2
*Saturday, October 19, 2013 at 8:54am*

**Geology**

Can someone please help me with my review? 1)What grade of metamorphism common rocks are formed in- --- Is it high grade? 2)What is the name of the most rapid kind of mass wasting is> -- Weathering? 3)How to tell is a rock is igneous, metamorphic or sedimentary. 4)How to ...
*Thursday, October 17, 2013 at 11:50pm*

**Geogoly**

Can someone please help me with my review? 1)What grade of metamorphism common rocks are formed in- --- Is it high grade? 2)What is the name of the most rapid kind of mass wasting is> -- Weathering? 3)How to tell is a rock is igneous, metamorphic or sedimentary. 4)How to ...
*Thursday, October 17, 2013 at 11:42pm*

**Pre Algebra**

In Wilbur's math class, his grade is based on the average score of six tests, each worth 100 points. Wilbur always worries about his grade. He knows that his average on the first four tests is 88.5. What is the lowest average he could get on his next two tests and still ...
*Thursday, October 17, 2013 at 8:58pm*

**Calculus**

since ln(x) has domain x>0, we need -4(x^2-2.75) > 0 -√11/2 < x < √11/2 Note that this also works for the 2nd term, since it must be nonzero. That is, x ≠ √11/2
*Thursday, October 17, 2013 at 12:40pm*

**English**

Nursery school is for children before the age of kindergarten. Kindergarten is usually for children who are at least 5 years old by a certain date (such as Sept 1st). This grade is preparation for 1st grade and onward. Day care is for children of various ages, not really ...
*Wednesday, October 16, 2013 at 7:32pm*

**Physics**

ocw.mit.edu/courses/physics/8-01t-physics-i-fall-2004/assignments/ps07sol.pdf check q4 plug in your values, i got different values i am figuring out the 2nd part
*Tuesday, October 15, 2013 at 2:03pm*

**fast answer plss**

the sum of four angles about a point is 360degree.the measure of the 2nd angle is 6degreemore than 3times the 1st,the measure of the 3rd is 3degree more than twice the first,the measure of the 4th is 20 degree less than the 3rd.what is the measure of each angle?
*Friday, October 11, 2013 at 10:13am*

**Pre-Calculus**

I'd say revenue = price * demand If the 2nd equation is the demand function, then we have p = (22x+978)/484 revenue would thus be R(x) = p*x = x(22x+978)/484 Not sure why the supply curve is given. Doesn't matter how many widgets you can dump on the market if no one ...
*Wednesday, October 9, 2013 at 5:44am*

**Calculus**

f(x) = ax^n f'(x) = a*n*x^(n-1) Substitute the given conditions. f'(3) = a*n*(3)^(n-1) 14 = a*n*(3)^(n-1) f'(6) = a*n*(6)^(n-1) 28 = a*n*(6)^(n-1) We can solve this since there are two equations, two unknowns. From the first equation, we can say that a = 14 / n*(3...
*Tuesday, October 8, 2013 at 10:27pm*

**Math**

now: 85000 1st year : 85000(1.05) 2nd year: 85000(1.05)^2 etc can you see what I did ?
*Monday, October 7, 2013 at 7:11pm*

**Algebra, help needed**

what makes it especially difficult? You must have solved similar systems already. 2(1st)+(2nd) and 3(1st)-2(3rd): 5x - y = 27 5x + 2y = 6 Now it gets easier: 3y = -21 y = -7 so, x = 4 z = 2
*Monday, October 7, 2013 at 12:03pm*

**Physics/electricity**

In the Bohr model of the hydrogen atom, an electron in the 2nd excited state moves at a speed of 5.48X10^5 m/s in a circular path having a radius of 2.12X10^-10 m. What is the effective current associated with this orbiting electron?
*Sunday, October 6, 2013 at 11:42pm*

**College Math 45**

Mrs. Brown has 17 children in her first-grade class, and Mr. Lopez has 20 children in his second-grade class. The principal has been asked to select 1 student from one of the classes to appear at a PTA meeting. How many ways can the selection be made?
*Sunday, October 6, 2013 at 11:23pm*

**more news**

What is the Watergate scandal and why could this story not have happened in 2012? I know what the watergate scandal is, it was the political scandal that led to Nixons resignation where burglars who broke into the Democratic party headquarters had ties to his administration.. ...
*Sunday, October 6, 2013 at 8:21pm*

**Math**

A 154-pound woman walks at 3.0 mph 0% grade for 5 min, runs at 5.5 mph 5% grade for 32 min. What is her total caloric expenditure?
*Sunday, October 6, 2013 at 12:54pm*

**physics (it's rather urgent help is appreciated**

@ss01 if you check homework 2 the 2nd last question it shows you how to do question 2. for quetion 3 Ac must be 10m/s so you get 10=v^2/r and from there you can solve since i don't know what value of r you got
*Sunday, October 6, 2013 at 6:52am*

**Math**

take the 2nd and divide by 2 x - 2y = 3 x = 2y+3 plug that into the first 5(2y+3) + 7y = 18 10y+15+7y=18 25y=25 y=1 then x = 2(1) + 3 = 5 now that we have x=5, and y=1 evaluate 7x+3y
*Saturday, October 5, 2013 at 9:48pm*

**Math**

ahh...those algebra days... so, anyways, here's what u do... 1) identify the variables: Let the 1st integer be "x" Let the 2nd integer be "(x+1)" Let the 3rd integer be "(x+2)" 2) now, set up the equation... 3(x+2) - 9 = x + (x+1) 3) SOLVE ...
*Wednesday, October 2, 2013 at 6:31pm*

**Shurley English Grade 4**

I'm suppose to write sentences from Grade 4 Shurley English book. I was suppose to bring book home and use page 25 - I forgot the book - anyone know what is on page 25? Thanks
*Wednesday, October 2, 2013 at 5:41pm*

**Maths**

2nd term = 8 ----> a+d = 8 , #1 14th term is double the 4th term a+13d = 2(a+3d) a+13d = 2a + 6d a - 7d = 0 , #2 #1 - #2: 8d = 8 d = 1 then a=7 term 10 = a+9d = 7 + 9 = 16
*Wednesday, October 2, 2013 at 12:27pm*

**Maths**

The 14th term of an Ap is double the 4th term.find the 10th term if the 2nd term is 8
*Wednesday, October 2, 2013 at 12:19pm*

**Second Grade Reading**

Hello. I am a tutor. I tutor second grade students. I need a good website that will give me great tips on how I can better teach my students how to read, spell, and pronounce words. Can you please help me find a website like that?
*Saturday, September 28, 2013 at 10:42pm*

**French**

Did you have an example or just those instructions? 1. I agree with du vin but I have no idea what is required in the 2nd blank... Will you have some wine or ????? with your mean. le vin? I certainly would NOT use "de la" with vin! 2. agreed 3. agreed, although it ...
*Wednesday, September 25, 2013 at 8:41pm*

**Math**

what happened to the -9 in the 2nd line ahhh, it came back in the third You can't do that, that is considered "bad form" Proper way: (3×8+4^2)-9 = 24 + 16 - 9 = 40-9 = 31 do the second one in the same way, you again have disappearing and reappearing numbers...
*Tuesday, September 24, 2013 at 9:02pm*

**statistics**

suppose that grade point averages of undergraduate students at one university have a bell shaped distribution with a mean of 2.55 and a standard deviation of 0.43. Using the empirical rule, what percentage of students have grade point averages that are between 1.26 and 3.84
*Monday, September 23, 2013 at 9:10pm*

**Math**

number of cows = x number of chickens = y x+y = 197 4x + 2y = 634 or 2x + y = 317 subtract 2nd - 1st: x = 120 back into the first: 120+y = 197 y = 77 120 cows and 77 chickens
*Sunday, September 22, 2013 at 8:13pm*

**Math/Piecewise functions**

and the 2nd one would be 450+0.0585(x-15,000) which I would simplify. I still need help on the last one!
*Sunday, September 22, 2013 at 8:04pm*

**Math for Steve or Reiny or both!**

#1 ok #2 ok #3 ok #4 CP of addition #5 ok #6 ok, 6/(5+y) is better #7 ok #8 75 mph #9 -8n+5v reverse the sign of all terms #10 -4/5 s the g's cancel out #11 none is correct. You add up the deposits and subtract that from the ending balance: $72.31-($17.92+$15.33) typo? I ...
*Friday, September 20, 2013 at 8:19pm*

**english**

Can someone check my english essay. 700 words. I have English as 2nd language
*Friday, September 20, 2013 at 12:19pm*

**English**

You can see that all start with "h" so separate them by the second letter in each. Among all those with "Ha" at the beginning, which will obviously be 3rd? Then "Hay" will come before "Haygarths ..." Do you understand why? Of the two &...
*Sunday, September 15, 2013 at 7:08am*

**Order Pairs Math**

Well, just plug in the given value for x and see whether the y value works! y=x-3 which ordered pair has the 2nd number 3 less than the first? (5,2) Similarly, (-2,-10) (8,-54)
*Friday, September 13, 2013 at 6:58pm*

**pre-algebra**

There are 1,400 students in a school.The number of girls is 3/4 the number of boys.How many students are in the other grade levels if 1/6 of the girls and 1/5 of the boys in first grade?
*Thursday, September 12, 2013 at 9:18pm*

**math 5th grade**

Hunter school has a kindergarten and grades 1 through 6. there are 2 kindergarten and 2 classes in each grade. If the maximum class size is 25, what is the greatest number of students that could be in the school?
*Thursday, September 12, 2013 at 8:09pm*

**Math - Ratios**

In Mrs. Sotomayor's class, the final grade is based on 6 quizzes and 2 exams. If each exam counts for 3 times as much as each of the quizzes, what fraction of the final grade is determined by each exam?
*Tuesday, September 10, 2013 at 11:03pm*

**u.s. history**

well i was thinking about using some what along the lines of new inventions bring new era for the united state but my teacher said the paper has to be 5 paragraphs long with introduction 1st body(political changes)2nd body(economic changes,3rd body(social changes) and ...
*Monday, September 9, 2013 at 4:54pm*

**Intermediate Algebra**

for the polynomial function h(x)=2x to the 4th power-x to the 3rd power+2x to the 2nd power -4x-3 evaluate h(3)
*Saturday, September 7, 2013 at 1:59pm*

**health 5 grade**

i need help in health subject for my son 5 grade Question 1- connect suppose you have a cold. this affects your physical health. does if affect your mental,emotional,family, and social health, too? explain why or why not. Question 2- practice healthful behaviors Make a list of...
*Friday, September 6, 2013 at 8:21pm*

**6th grade math**

They are all correct great job for not getting LCM and GCF mixed up! I used to get them mixed up all the time when I was in 6th grade.
*Wednesday, September 4, 2013 at 10:51pm*

**Math**

The fifth and sixth grades at Oak Street School are having fair.There are 50 students total and 3/5 of the students are fifth grade students.How many fifth grade students are entered in science fair?
*Wednesday, September 4, 2013 at 10:47pm*

**Math**

The fifth and sixth grades at Oak Street School are having fair.There are 50 students total and 3/5 of the students are fifth grade students.How many fifth grade students are entered in science fair?
*Wednesday, September 4, 2013 at 9:49pm*

**French**

Look again at (ask someone to repair it for you. You gave me an example of the receiver only. Look at the 2nd set of examples, with an agent. THAT is what you need. Je fais réparer mon ordinateur Jacques. = I'm going to have Jack (agent) repair my computer (receiver...
*Wednesday, September 4, 2013 at 1:58pm*

**DISCRETE MATHS**

no, the set has 3 elements. the first is p the 2nd is the set {p} the third is the set {p,{p}}
*Monday, September 2, 2013 at 12:05pm*

**Physics**

1st week: 1/2 2nd week: 1/4 3rd week: 1/8 ...
*Thursday, August 29, 2013 at 2:36pm*

**Algebra**

the area of a triangle can be determined by using the formula A= 1/2bh, where b is the length of the base, and h is the length of the height. Determine the area of a triangle with a base which is 7x to the 2nd power and a height which is 8x feet.
*Monday, August 26, 2013 at 6:11pm*

**Physics !!**

Hmmm. 1) If y is the stone's height at t, and h is the building height, I get first stone: y = h - 4.9t^2 2nd stone: y = h - 25(t-2) - 4.9(t-2)^2 i: t = 5.63 the rest is easy...
*Monday, August 26, 2013 at 12:40pm*

**Algebra **

The ages of three brothers are three consecutive even integers. If the sum of the 1st, four times the 2nd, and twice the 3rd is 86, what is the age of the oldest brother?
*Saturday, August 24, 2013 at 2:58pm*

**maths**

let the amount he started with be x after first round he has 2x-P in 2nd round he tripled that and gave away 2P so has left 6x - 3P - 2P = 6x - 5P in 3rd round he quadrupled the amount and gave away P so he has left 24x - 20P - P = 24x - 21P amount given away = P + 2P + P = ...
*Friday, August 23, 2013 at 8:33am*

**ENGLISH**

How to do this......please show me.... Take 2 A4 sheet.On one write PROPER NOUNS and stick related picture cut outs.On the 2nd sheet write COMMON NOUNS and paste related picture cut outs.
*Thursday, August 22, 2013 at 3:55pm*

**English**

Nursery school is for children before the age of kindergarten. Kindergarten is usually for children who are at least 5 years old by a certain date (such as Sept 1st). This grade is preparation for 1st grade and onward. Day care is for children of various ages, not really ...
*Tuesday, August 20, 2013 at 4:55am*

**Math**

First, try plotting (-3,1) on a graphing paper. You'll see it's in the 2nd Quadrant. When you reflect it on the y-axis, the new point will be on the third quadrant (where both x & y coordinates are negative). Therefore the new point is at (-3,-1). Hope this helps~ :)
*Monday, August 12, 2013 at 11:35pm*

**math**

Ez stop fast gas sold 10957 worth of gasoline yesterday. Redular grade sold for 2.30 a gallon and premium grade sold for 2.55 a gallon. If the station sold 420 more regular than premium, how many gallons of regular were sold
*Monday, August 12, 2013 at 2:12am*

**statistics**

1. I took a sample of the grade point averages for students in my class. For 25 students, the standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was:
*Sunday, August 11, 2013 at 2:58am*

**Math**

1st times 4 --> 12x + 16y = 72 2nd as is ----> 12x + 7y = 4 subtract them: 9y = 68 y = 68/9 back in 1st: 3x + 4(68/9) = 18 3x = 18 - 272/9 = -110/9 x = -110/27
*Thursday, August 8, 2013 at 8:04am*

**children who require special treatment**

mr.ames is married and has two children.he abuses alcohol.a family therapist would classify mr ames family as have a sick family pattern of a ? a.weak father b.2nd class family c.malevolent mother d.soluble dad my answer is d
*Wednesday, August 7, 2013 at 4:53pm*

**Algebra**

if f and g are inverses, f(g(x)) = x f(x) = x+6 f(g) = g+6 = (x+6)+6 = x+12 so, f and g are not inverses. Same for the 2nd part. If f(x) is the same as g(x), they are not inverses unless f(x) = x g(x) = x i think you have some typos in your write-up.
*Monday, August 5, 2013 at 7:10pm*

**Algebra - eh?**

what is it you have to solve for? "an inverse function" doesn't help much f -1(x)? g -1(x)? (f◦g) -1(x)? In the 2nd part, do you mean f(x) = 1/(4x) or (1/4)x? and is g the same as f?
*Monday, August 5, 2013 at 7:08pm*

**Stats**

Hello Charlotte. Helen told us a lot. I f you have a 2nd account try some different from Helen's. Unofortunately i cant have access on a second account this week..
*Monday, August 5, 2013 at 2:59pm*

**math**

No ideas at all? From the problems you have posted, I would think that an algebra I problem like this would be no challenge. solve for x in the 1st, and substitute it into the 2nd. Then solve for 3y.
*Saturday, August 3, 2013 at 6:14pm*

**math**

first term --- a common ratio --- r The sum of second term and fourth term of G.P is 30 ---> ar + ar^3 = 30 ar(1 + r^2) = 30 , #1 difference between sixth term and second term is 90 --> ar^5 - ar = 90 ar(r^4 - 1) = 90 , #2 divide #2 by #1 (r^4 - 1)/(1+r^2) = 3 (r^2 + 1)(...
*Saturday, August 3, 2013 at 9:05am*

**business math**

18. E-Z Stop Fast Gas sold $10,957 worth of gasoline yesterday. Regular grade sold for $2.30 a gallon and premium grade sold for $2.55 a gallon. If the station sold 420 more gallons of regular than of premium, how many gallons of regular were sold? (Points : 2)
*Thursday, August 1, 2013 at 4:25pm*

**math**

ideal setup for "substitution" 1st into 2nd: 7x + 4(-2x+2) = 7 7x + 8x + 8= 7 -x = -1 x = 1 plug that back into 1st, all done
*Friday, July 26, 2013 at 7:20am*

**BTech, Mechanical**

For the 1st ball, the time of the upward motion v=v₀-gt v=0 0=v₀-gt t= v₀/g =18/9.8=1.83 s. The height of the 1st ball h= v₀t-gt²/2=18•1.83 - 9.8•(1.83)²/2= =16.53 m The time of the 1st ball downward motion before the 2nd ball begins...
*Monday, July 22, 2013 at 1:44pm*

**calculus**

I have reduced that to a trivial problem. The whole point of this problem is to find out how to solve it, not to get the correct answer, although I know that this is part of the Brilliant competition and the correct answer does matter here, which simply shows that this is a ...
*Sunday, July 21, 2013 at 7:11am*

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