Wednesday
April 23, 2014

Intermediate algebra
let number of AC adapters be x let number of flashlights be y 7x + 2y = 86 3x + 4y = 84 double the first equation 14x + 4y = 172 3x + 4y = 84 subtract them 11x = 88 x = 8 sub back into 1st: 7(8) + 2y = 86 2y = 30 y = 15 so 8 adapters and 15 flashlights. Check my answer to see ...
Friday, February 21, 2014 at 4:07pm

life science,history,6eography,and maths lit
You know there are many carrers out there,problem is that most people get discouraged by people who are in the science nd commencial steams#you can study criminology,practise law even to do law nd do media#besids oif you happnd to choose those subjects to get out of the high ...
Friday, February 21, 2014 at 5:37am

Your Daughter should go to the Library an get books above her grade have her start studying that and studying her normal stuff even harder. Now I don't think yo should cram her brain but, I definitely think that if she wants to go to a G&T School that's what she needs ...
Thursday, February 20, 2014 at 2:01pm

Math.G.P
arithmetic mean of 1st and 3d = (x-2 + x+6)/2 = (2x + 4)/2 = x+2 let the 2nd be y then y/(x-2) = (x+6)/y y^2 = (x-2)(x-6) y = ± √((x-2)(x+6)) mean:2nd = 5:3 (x+2)/√((x-2)(x+6)) = 5/3 square both sides and expand (x^2 + 4x + 4)/(x^2 + 4x - 12) = 25/9 25x^2 + ...
Friday, February 14, 2014 at 9:28am

MAT-134 Math XL
Graph the following linear equation using one of the following methods: 1st slope intercept form y = mx + b 2nd table of values 3rd x-intercept and y-intercept 1. 3x + 4y = 12
Thursday, February 13, 2014 at 3:43pm

Statistics in Psychology
What research steps must you go through to use the relationship between a person’s intelligence and grade average in high school so that, if you know a person’s IQ, you can more accurately predict the person’s grade average?
Monday, February 10, 2014 at 1:17pm

STATISTICS
What research steps must you go through to use the relationship between a person’s intelligence and grade average in high school so that, if you know a person’s IQ, you can more accurately predict the person’s grade average?
Monday, February 10, 2014 at 5:29am

economic
Suppose, unfortunately , your mathematics and economics professors have decide to give tests 2 day from now and you can spend only a total of 12 hours studying for exams .After some thought, you conclude that dividend your study time equally between each subject will give you ...
Sunday, February 9, 2014 at 12:24am

economic
10. Suppose, unfortunately , your mathematics and economics professors have decide to give tests 2 day from now and you can spend only a total of 12 hours studying for exams .After some thought, you conclude that dividend your study time equally between each subject will give ...
Sunday, February 9, 2014 at 12:18am

physics
Vo*t + 0.5g*t^2 = 100-50 = 50 0 + 4.9t^2 = 50 t^2 = 10.20 t = 3.19 s. V = Vo + g*t = 0 + 9.8*3.19 = 31.3 m/s = The velocity after the 1st 50 m drop = The initial velocity (Vo) for the 2nd 50 m drop. 31.3*t + 4.9t^2 = 50 4.9t^2 + 31.3t - 50 = 0 t = 1.32 s.(Use Quad. Formula).
Sunday, February 2, 2014 at 7:44pm

Does anyone know of a good place that I can practice 12th grade vocabulary antonyms?
Saturday, February 1, 2014 at 3:17pm

physics
1st fall: 2m nth bounce: 2*(3/4)^n So, you have to decide what "at rest" means. At some point the friction will overcome the tendency to bounce, and the bounces will stop. In theory, the ball bounces forever, each time achieving less height. So, once you decide how ...
Friday, January 31, 2014 at 1:33pm

I will do the 2nd, you do the 1st in the same way f(x) = (2x+4)/(2x-1) or y = (2x+4)/(2x-1) inverse by switching x's and y's x = (2y+4)/(2y-1) simplify and solve this for y .... 2xy - x = 2y+4 2xy - 2y = x+4 y(2x - 2) = x+4 y = (x+4)/(2x-2) f^-1 (x) = (x+4)/(2x-2) , x...
Tuesday, January 21, 2014 at 8:07am

Math
Oh yeah, the ellie one is from Fourth Grade math, Chapter 8, 8-6 so I believe trent, you may be in fourth grade. I had that problem a year ago
Monday, January 20, 2014 at 5:35am

statistics
What is the probability for a: a.       Randomly selected person being a male in grade E? b.      Randomly selected male being in grade E? c. Why are the results different?
Sunday, January 19, 2014 at 11:23pm

Algebra II
I'd use elimination, since the coefficients are small to eliminate x, subtract the 1st two, subtract twice #1 from #3 and we have -5y - z = -18 -9y + 5z = -26 now eliminate y or z in the same way, and then plug the values back in to obtain the others.
Friday, January 17, 2014 at 4:29pm

Math quick help anyone
since the slope is 1/4, you know that y will increase by 1 when x increases by 4. Since x increased from -12 to 8 (20), y will increase by 1/4 (20) = 5. So, w=6+5=11. If the slope had been -1/4, w = 6-5 = 1 #2. multiply the 1st equation by 3 and you now have 9x-6y-24=0 9x-6y-...
Thursday, January 16, 2014 at 12:23am

Math
well, the 2nd equation says y = 3.5/(3x+1) so, plugging that into the 1st equation, we have x^3 - 12.25/(3x+1)^2 = 7.75 (36x^5+24x^4+4x^3-279x^2-186x-80) / 4(3x+1)^2 = 0 a little synthetic division yields x=2
Wednesday, January 15, 2014 at 5:46pm

Physics help
I'm trying to calculate the tension in a rope. The two ropes are holding up a picture frame that is 100N, each rope is at a 45 degree angle. I'm trying to find the value of the tension of the 1st rope. Please help
Friday, January 10, 2014 at 10:56pm

Wednesday, January 8, 2014 at 6:12pm

Math - Algebra
Von's arcade uses 3 different colored tokens for its game machines. For 500, you can purchase any of the following combinations of tokens: 8 gold, 18 silver, and 7 bronze tokens; 8 gold, 14 silver, and 13 bronze tokens; or 16 gold, 6 silver, and 9 bronze tokens. What is ...
Saturday, January 4, 2014 at 9:26pm

math
Treat these as if they were equations but keeping the in-equality sign instead of the equal sign, EXCEPT when you multiply or divide the in-equation by a negative, you must reverse the inequality sign. e.g. last one: -8x > -64 I would have to divide by -8 to get +x , so x &...
Thursday, December 19, 2013 at 12:07pm

Math
1st one, in your head, a = 4 or a = -2 2. |2a+5| > 3 2a+5 > 3 OR -2a -5> 3 a > -2 OR a < -4 3. looks like a typo , I see neither an equation nor an in-equation. If it is one of those, first divide both sides by 3, then it is very easy.
Tuesday, December 17, 2013 at 6:24pm

I have a math question that I do not really understand how to answer is there someone who can walk me through it? In Pinecrest middle school there are 58 6th graders 76 7th graders, and 38 8th graders. The counsel is made up of 35 students who are chosen to represent all three...
Tuesday, December 17, 2013 at 3:42pm

physics
An automobile moving at a constant velocity of 15 m/s passes a gasoline station. Two seconds later, another automobile leaves the station and accelerates at a constant rate of 2 m/s^2 in the same direction as the 1st automobile. How soon does the 2nd automobile overtake the ...
Monday, December 16, 2013 at 4:36am

math
just solve as for equations. If you find the roots, then for the parabola, y>=0 outside the interval containing the roots. For the cubic, you know y<0 where x is less than the smallest root. y>0 between the 1st and 2nd roots, y<0 between the 2nd and 3rd roots y>...
Sunday, December 15, 2013 at 6:14pm

math
1/13 = .076923076923076923... notice the repeat is 076923 is 6 digits long 1st after decimal is 0 7th after the decimal is 0 13th after the decimal is 0 ... 37th after the decimal is 0 43rd after the decimal is 0 notice that the numbers 1,7,13, ... 37, 43 all leave a remainder...
Saturday, December 14, 2013 at 9:50pm

algerbra
Since the + and = signs are on the same key, I suspect you meant 3x-2y = 8 2x+2y = 22 ---->x+y=11 --->y = 11-x sub into the 1st 3x - 2(11-x) = 8 3x - 22+2x = 8 5x = 30 x = 6 then y = 11-6 = 5
Thursday, December 12, 2013 at 7:49pm

Mathematics
The 25 term of an Arithmetic Progression is 7 1/2 and the sum of the first 23 terms is 98 1/2. Find the i. 1st term ii. common difference iii. sum of the first 30 terms
Wednesday, December 11, 2013 at 7:25pm

college intermediate algebra
1st person: X min. 2nd person: (X+20) min. X*(X+20)/(X+X+20) = 24 min. (X^2+20X)/(2X+20) = 24 X^2+20X = 48X+480 X^2-28X-480 = 0 Use Quadratic formula and get: X = 40 min. X+20 = 60 min.
Tuesday, December 10, 2013 at 8:35pm

Bill's monthly payment is \$1,056 per month. The principal is \$100,000 at a rate of 12 1/2 percent for 35 years. The amount of interest for Bill's 1st payment is \$1,011.67. True False
Sunday, December 8, 2013 at 1:53am

math
1st TV = 750 2nd TV = 750 * 0.55 = 412.50 3rd TV = 750 * 0.2 = 150 1.06(750 + 412.5 + 150) = \$1,391.25
Saturday, December 7, 2013 at 1:11pm

Math
Did you mean 2x - 5y = -8 for the first one ? I will assume that is what you meant: Personally I would not use substitution, but .... from the 2nd 26-3x = 2y (26-3x)/2 = y into the 1st: 2x - 5(26-3x)/2 = -8 times 2 to get rid of that fraction ... 4x - 5(26-3x) = -16 4x - 130...
Saturday, December 7, 2013 at 12:28am

i need help math
1st TV = 750 2nd TV = 750 * 0.55 = 412.50 3rd TV = 750 * 0.2 = 150 1.06(750 + 412.5 + 150) = \$1,391.25
Friday, December 6, 2013 at 5:58pm

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
your finance text book sold 47,500 copies in the 1st year the publishing company expects the sales to grow at a rate of 23.0 percent for the next three years and by 12.0 percent in the fourth year calculate the total number of copies that the publisher expect to sell in year 3...
Wednesday, December 4, 2013 at 5:20am

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

Algebra!
x+y=108 3.5x+7.5y=506 1st eq * 3.5 = 3.5x+3.5y = 378 subtract from second equation 4y = 128 y=32 x=76 (32+y=108 | 108-32 = 76)
Monday, December 2, 2013 at 9:05pm

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

Math
rearrange things a bit to get x-3y=5 3x-5y=7 If you multiply the 1st equation by 3, you have 3x-9y=15 3x-5y=7 Now just subtract to eliminate x and you get -4y = 8 y = -2 Now use either equation to solve for x.
Wednesday, November 27, 2013 at 1:54pm

Algebra 1
It is considered "poor form" to have the equation in standard form start with a negative x or containing fractions. so the 1st one I would write as x - y = -8 the last one: firs of all it should have been (-1/2)x + y = 23/2 multiply each term by -2 x - 2y = -23
Thursday, November 21, 2013 at 9:10pm

i gt q1 all the first part not second one? please help in it question 3 i got 1st part not second
Wednesday, November 20, 2013 at 11:34pm

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

TO ANY MATH HELPERS
1. from the 1st equation: x = 3y+1 into the 2nd: 3(3y+1) - y +1 = 0 9y + 3 - y +1 = 0 8y = -4 y = -1/2 sub into 2nd: 3x - (-1/2) + 1 = 0 3x = -3/2 x = -1/2 Do #2 the same way from the 2nd: y = 2x+4 etc (Just stating the answers is not acceptable and serves no purpose)
Monday, November 18, 2013 at 9:04pm

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

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

algebra
t = .10a + 2f + .5v + (3000 - d/100) assuming the area and volume of the 2nd house are the same, only 2f - d/100 changes. Since the 1st house paid 5000 in taxes, and we have new variables of d+2000 and f+10, the new taxes are 5000 + 2(10) - 20 = 5000 same taxes due
Friday, November 8, 2013 at 12:02am

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
a woman weighs Fg=650 when standing on a stationary scale. The woman is riding an elevator from the 1st floor to the 10th floor. As the elevator approaches the 10th floor, it decreases its upward speed from 9 m/s to 1 m/s in a time interval of 1 second. What is the average ...
Saturday, November 2, 2013 at 1:21pm

Physics
WOMAN IN ELEVATOR A woman weighs Fg= 650 N when standing on a stationary scale. Now, the woman is riding an elevator from the 1st floor to the 10th floor. As the elevator approaches the 10th floor, it decreases its upward speed from 8 m/s to 1 m/s in a time interval of 1 s. ...
Saturday, November 2, 2013 at 12:42pm

Physics
A woman weighs Fg= 600 N when standing on a stationary scale. Now, the woman is riding an elevator from the 1st floor to the 10th floor. As the elevator approaches the 10th floor, it decreases its upward speed from 7 m/s to 1 m/s in a time interval of 1 s. What is the average ...
Saturday, November 2, 2013 at 12:09am

question
i need some advice im a freshmen in hghschool and i have one honor class this semester and the 1st term i got a 80.6 and im struggling more is it better to be in it or just take regular and have an a over a b are their any benefits of it
Friday, November 1, 2013 at 10:38pm

Algebra 1
amount earned by 1st --- x amount earned by 2nd --- 18500-x if first had earned 500 less, they would be the same x - 500 = 18500 - x 2x = 19000 x = 9500 one earned 9500 , the other 9000 6. time for car 3 --- x time for car 1 --- x+5 time for car 5 --- x +8 time for car 4 ---- ...
Monday, October 28, 2013 at 8:08pm

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

Algebra Help
let rate in 1st leg be x mph time takenfor 1st leg = 24/x hrs rate for 2nd leg = x-10 time for 2nd leg = 6/(x-10) remaining distance = 80-24-6 = 50 miles time for last leg = 50/(1.5x) time for whole trip at x mph = 80/x difference in times = 22 minutes = 22/60 hrs 80/x - 24/x...
Friday, October 25, 2013 at 9:50pm

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

correction - math
1st one: if f(x) = x/(x+2) , then y = x/(x+2) step1: interchange the x and y variables to get the inverse as x = y/(y+2) step 2: solve this new equation for y x = y/(y+2) xy + 2x = y xy - y = -2x y(x-1) = -2x y = -2x/(x-1) or y = 2x/(1-x) f^-1 (x) = 2x/(1-x) now do the same ...
Friday, October 18, 2013 at 12:12am

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

maths
using only the information you gave, sketch two triangles let the height of the tower be h let the length of the shadow at 45° be m then the length of the shadow at 30° is m+2x tan 45 = h/m and tan 30 = h/(m+2x) 1 = h/m and 1/√3 = h/(m+2x) m = h and m+2x = h&#...
Thursday, October 17, 2013 at 12:51pm

Math
using your rule, do you get the given sequence? Here's a method of attack: You know that 1+3+5+...+n = n^2 adding up the 1st n odd numbers gives you n^2. In your sequence, you have 1 1+4 1+4+6 1+4+6+8 which looks very similar. So, expect something with n^2 in it. 1 = 2^2-3...
Monday, October 14, 2013 at 2:28pm

Algebra Homework, HELP!
1 ) W = 4 L - 3 A = L * W = 297 L * ( 4 L - 3 ) = 297 4 L ^ 2 - 13 L = 297 Subtract 297 to both sides 4 L ^ 2 - 3 L - 297 = 297 - 297 4 L ^ 2 - 3 L - 297 = 0 Solutions : L = - 33 / 4 and L = 9 The length can't be negative so L = 9 in W = 4 L - 3 W = 4 * 9 - 3 W = 36 - 3 W...
Monday, October 14, 2013 at 2:26am

maths
A for the 1st one, 45 dollars per hour, x, is 45x. The fixed-service is a one-time thing so it's c = 45x + 65.The 2nd one is D. The original cost of the copier is 5,500. 5500-2500 = 3000. This is the cost reduction over the ten years. 3000/10 is 300: The amount it gets ...
Saturday, October 12, 2013 at 11:13am

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

the measures of the2nd angle of a triangle is 20degree more than the complements of the first triangle and the 3rd angle is 4 degree less than half the supplement of the 1st.find the measure of each angle
Friday, October 11, 2013 at 9:46am

the measures of the2nd angle of a triangle is 20degree more than the complements of the first triangle and the 3rd angle is 4 degree less than half the supplement of the 1st.find the measure of each angle
Friday, October 11, 2013 at 9:46am

VNS,Math
let distance he went each way be x miles time for first leg = x/4 time for 2nd leg = x/3 x/4 + x/3 = 7/2 times 12 3x + 4x = 42 x = 6 he went 6 miles into the road check: time for 1st part = 6/4 hrs time for 2nd part = 6/3 hrs and 6/4 + 2 = 3/2 + 2 = 7/2
Wednesday, October 9, 2013 at 1:41pm

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
Yeah, it takes a bit of practice. Look for LCMs to get rid of stuff. In this case, since 3*2=6, we had to take 3 times the 1st to get 6 and 2 times the 3rd to get 6. Usually the errors come in watching the other coefficients. In the beginning, it helps to write everything down...
Monday, October 7, 2013 at 12:27pm

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

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

Algebra
add the 1st and 3rd 5y + 2z = -14 from the 2nd: z = -2y-5 plug into 5y + 2z = -14 5y + 2(-2y-5) = -14 y = -4 into the 3rd: 3x -24 = -21 3x =3 x = 1 btw: z = 3
Friday, October 4, 2013 at 12:41pm

Math
Julie has been offered two jobs. The 1st one pays \$400 per week. The 2nd job pays \$175 per week plus 15% commision of her sales. How much will she have to sell i n order for the 2nd job to pay as much as the first? how do you do this? i dont know the steps to.
Thursday, October 3, 2013 at 7:44pm

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

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

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

Math
cos 4x = sin x 2cos^2 2x - 1 = sin x 2(1 - 2sin^2 x)^2 - 1 = sin x Now you have to solve a quartic in sin x. You know from the very 1st equation that pi/2 is a solution. The others are not so simple. Visit wolframalpha.com and enter solve cos 4x = sin x to see the graphs and ...
Wednesday, September 25, 2013 at 5:51am

more News
1. Here are some critical reading points: Exactly who are "senate democrats"? Is it three, or 51? 2. What is the point of View of the Wall Street Journal? What interest do they have in all this? Is it possible they are trying to calm their readers? Is it possible ...
Tuesday, September 24, 2013 at 3:20pm

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

question
is it better to take physics or chemistry if taking both whats better to take 1st in sophomore year better to take ap statistics or precalculas for becoming an architect
Sunday, September 22, 2013 at 1:05pm

maths
There are 4! ways to arrange m,a,t,h in the 1st 4 places. Of these, 3! have t as the last letter. The remaining letters are aaabhr, which can be arranged in 6!/3! ways. So, we have (4!-3!)(6!/3!) ways with t not in the 4th place. Add to that (3!)(6!/3! - 5!/3!) ways of having ...
Friday, September 20, 2013 at 1:38pm

English writing a concluding paragraph
I have to write from specific to general in my concluding paragraph and can't have any contractions, no 1st person or second person , no rhetorical questions , no in conclusion, in summary, etc
Thursday, September 19, 2013 at 8:17pm

dma040
42inch board is cut into 3peices. Peice 2 is twice as long as the 1st & 3rd peice. Peice 3 is three times as long as peice 1. What are the lengths of all 3 peices? Pc 1 Pc 2 Pc 3
Monday, September 16, 2013 at 10:13am

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

dma 040
42 inch board is cut into 3 pieces. Piece 2 is twice as long as the 1st & 3rd piece. Piece 3 is three times as long as piece 1. Find inches of all three pieces
Saturday, September 14, 2013 at 10:42pm

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

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

Money and Banking
1. A firm uses capital to produce revenue. The marginal revenue from the first 5 units of capital is as follows: 1st unit has MR 2.30, 2nd unit has MR 1.9, 3rd unit has MR 1.70, 4th unit has MR 1.35, and 5th unit has MR 1.15. If the interest rate is 50%, what is the optimal ...
Sunday, September 8, 2013 at 6:37pm

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