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April 23, 2014

April 23, 2014

**Recent Homework Questions About Arithmetic**

Post a New Question | Current Questions

**Arithmetic**

A box in a college bookstore contains books, and each book in the box is a history book, an English book or a science book. If one-third of these books are history books and one-sixth are English books, what fraction of the books are science books?
*Tuesday, March 19, 2013 at 10:23am*

**arithmetic **

The measure of two angles of a triangle are 35* and 45*. What is the measure of the third angle of the triangle? A. 95* B. 100* C. 105 D. 110*
*Tuesday, March 19, 2013 at 10:15am*

**7th Grade Math**

http://www.mathsisfun.com/algebra/sequences-sums-arithmetic.html http://www.mathsisfun.com/algebra/sequences-sums-geometric.html
*Monday, March 18, 2013 at 1:03pm*

**7th Grade Math**

What is arithmetic and geometric sequences?
*Monday, March 18, 2013 at 12:43pm*

**number theoRY!!!**

How many integers appear in both of the following arithmetic progressions: A1: 2, 9, 16,.....2+(1000-1)*7 A2: 3, 12, 21,.....3+(1000-1)*9 Since 2 appears in A1 but not in A2, it does not appear in both of the arithmetic progressions.
*Monday, March 18, 2013 at 3:11am*

**arithmetic**

the answer is 12
*Sunday, March 17, 2013 at 3:00pm*

**trigonometry**

radius of wheel = 24 inches one rotation = 2π(24) = 48π inches in 1 hour it goes 55 miles = 55x5280x12 inches = 3484800 inches number of rotations per hour = 3484800/(48π) = 23109.29774 rotations per hour = 385.155 rpm = 385.155x(2π) radians /min = 2420 ...
*Friday, March 15, 2013 at 10:32pm*

**mathematics**

the 1st term of arithmetic series is 2 .the 1st ,3rd and 11th terms are the first the terms of a geometric series. find the 6 terms of the arithemetic series
*Thursday, March 14, 2013 at 10:54pm*

**calculus**

a) Assuming you meant x^3 + y^3 - x y^2 = 5 3x^2 + 3y^2 dy/dx - x(2y)dy/dx - y^2 = 0 dy/dx(3y^2 - 2xy) = y^2 - 3x^2 dy/dx = (y^2 - 3x^2)/(3y^2 - 2xy) b) just arithmetic, you do it c) yours d) for a horizontal tangent, dy/dx = 0 then y^2 - 3x^2 = 0 y^2 = 3x^2 y = ± x&#...
*Wednesday, March 13, 2013 at 9:26pm*

**arithmetic**

20 divided by 5 = ?? multiply that number (??) by 3 What's your answer?
*Wednesday, March 13, 2013 at 5:04pm*

**arithmetic**

If I cut a cake in 20 pieces & I ate 3/5 of the pieces , how many pieces did I et
*Wednesday, March 13, 2013 at 5:04pm*

**Math/209**

No top ? So I see a base which is (50-2x) by (40-2x) and I see a height of x total surface area = (50-2x)(40-2x) + 2x(50-2x) + 2x(40-2x) =2000 - 180x + 4x^2 + 100x - 4x^2 + 80x - 4x^2 = -4x^2 + 2000 -4x^2 + 2000 = 1900 -4x^2 = -100 x^2 = 25 x = √25 = 5 check my arithmetic
*Tuesday, March 12, 2013 at 9:09pm*

**MAths algebra**

Tiger woods won the Buick Invitational.The following scorecard shows the result of Round1.there are 18 holes? per round and the table shows the number of times woods got each type of score. Score on a hole and Number of times score occurred Eagle (-2) 2 Birdie(-1) 4 Par (0) 10...
*Tuesday, March 12, 2013 at 11:31am*

**CHRIST MATH**

I will assume that AP stands for arithmetic progression so you are given: a + (a+d) + (a+2d) + (a+3d) = 20 4a + 6d = 20 2a + 3d = 10 product of 1st and 4th = a(a+3d) product of 2nd to 3rd = (a+d)(a+2d) then: a(a+3d)/( (a+d)(a+2d) ) = 2/3 (a^2 + 3ad)/(a^2 + 3ad + 2d^2) = 2/3 3a...
*Tuesday, March 12, 2013 at 9:50am*

**Math**

A triangle has a total of 180 degrees. Since the right angle = 90 degrees. There is a total of 90 degrees left for the other two angles. Their sum divided by 2 gives the arithmetic mean of 45 degrees
*Monday, March 11, 2013 at 3:07pm*

**Math**

In right triangle ABC what is the arithmetic mean (average), in degrees, of the measures of the two smallest angles? Explain how the answer is 45 degrees.
*Monday, March 11, 2013 at 3:05pm*

**Math**

let the radius be r let the height be h Volume = πr^2h πr^2h = 400 h = 400/(πr^2) cost = different prices x surface areas = .03(2πrh) + 2(.06) πr^2 = .03[2πr(400/πr^2) + 4πr^2] = .03[ 800/r + 4πr^2] d(cost)/dr = .03[ -800/r^2 + 8&#...
*Sunday, March 10, 2013 at 5:25pm*

**Math**

ah, here is the Gauss history I was looking for: When the great Mathematician Gauss (Germany) was about 12 years old, his teacher asked the whole class to add up all the integers starting from 1 up to 100. All other children started doing long and boring addition as you did ...
*Saturday, March 9, 2013 at 1:29pm*

**math**

Alan and Bob are playing with numbers. Starting with the number n=1 they take turns performing arithmetic manipulations with n. Alan goes first and always multiplies n by 3. Bob adds 1 or 2 to the number n, depending on a coin toss. A number is called reachable, if it can ...
*Friday, March 8, 2013 at 11:22am*

**Algebra**

Alan and Bob are playing with numbers. Starting with the number n=1 they take turns performing arithmetic manipulations with n. Alan goes first and always multiplies n by 3. Bob adds 1 or 2 to the number n, depending on a coin toss. A number is called reachable, if it can ...
*Thursday, March 7, 2013 at 10:46pm*

**pre-calculus**

find the common difference in an arithmetic sequence in which a(sub 15)-a(sub7)=-1. what should i start with ??
*Thursday, March 7, 2013 at 8:46pm*

**math**

The sum of the first 10 terms of an arithmetic series is 145 and the sum of its fourth and ninth term is five times the third the..determine the first term and constant difference
*Thursday, March 7, 2013 at 2:43pm*

**Geometry**

From the secant-secant rule, FB*21 = 6*39, so FB=78/7 AD+DE+EB = 3+39+6 = 48 CG+21+FB = 48, so CG = 111/7 CH*HI = CG*CF = 111/7 * 258/7 = 28638/49 AI*HI = 3*39 = 117 AI+IH+HC = 48 117/HI + HI + 28638/49HI = 48 now "just" solve for HI The fractions look nasty, so you ...
*Thursday, March 7, 2013 at 10:51am*

**math**

so you want 25+26+.. for 30 terms an arithmetic series where a=25 , d=1 ,and n=30 sum(3) = (30/2)(50 + 29(1)) = 1185
*Thursday, March 7, 2013 at 10:27am*

**arithmetic**

the sum of two distinct numbers is 20,and their G.M is 6. find the numbers
*Wednesday, March 6, 2013 at 9:18pm*

**arithmetic**

oops. forgot to add in the 32 for the last line
*Wednesday, March 6, 2013 at 3:31pm*

**arithmetic**

3 4,5 12,15 13,14,16,17 39,42,48,51 40,41,43,44,49,50,52,53 120,123,129,132,147,150,156,159 121,122,124,125,130,131,133,134,148,149,151,152,157,158,160,161 363,366,372,375,390,393,399,402,444,447,453,456,471,474,480,483 32 numbers, all above 363, so the next step...
*Wednesday, March 6, 2013 at 3:12pm*

**arithmetic**

Alan and Bob are playing with numbers. Starting with the number n=1 they take turns performing arithmetic manipulations with n. Alan goes first and always multiplies n by 3. Bob adds 1 or 2 to the number n, depending on a coin toss. A number is called reachable, if it can ...
*Wednesday, March 6, 2013 at 11:16am*

**arithmetic pizzle**

12×3-4
*Wednesday, March 6, 2013 at 10:23am*

**algebra**

You have an arithmetic series where a = 2, d = 3, n = 10 sum(10) = (10/2)(4 + 9(3)) = 5(31) = 155 looks like you are right.
*Tuesday, March 5, 2013 at 10:38pm*

**algebra**

Find the 11th term of the arithmetic sequence 7, 4.4, 1.8, -0.8, … A. -33 B. -19 C. 33 D. 19 B
*Tuesday, March 5, 2013 at 9:28pm*

**poetry**

Arithmetic by Carl Sandburg Arithmetic is where numbers fly like pigeons in and out of your head. Arithmetic tell you how many you lose or win if you know how many you had before you lost or won. Arithmetic is seven eleven all good children go to heaven -- or five six bundle ...
*Monday, March 4, 2013 at 8:34pm*

**poetry**

It's definitely light hearted. http://www.poemhunter.com/poem/arithmetic/
*Monday, March 4, 2013 at 8:32pm*

**poetry**

What is the authors tone in the poem arithmetic?
*Monday, March 4, 2013 at 8:25pm*

**arithmetic**

find the APR to the nearest half percent, for the following data. purchase price $3500, down payment $500, add-on interest rate 7%, # of payments 18
*Monday, March 4, 2013 at 6:35pm*

**Algebra**

Alan and Bob are playing with numbers. Starting with the number n=1 they take turns performing arithmetic manipulations with n. Alan goes first and always multiplies n by 3. Bob adds 1 or 2 to the number n, depending on a coin toss. A number is called reachable, if it can ...
*Monday, March 4, 2013 at 4:53pm*

**Algebra**

Alan and Bob are playing with numbers. Starting with the number n=1 they take turns performing arithmetic manipulations with n. Alan goes first and always multiplies n by 3. Bob adds 1 or 2 to the number n, depending on a coin toss. A number is called reachable, if it can ...
*Monday, March 4, 2013 at 12:26am*

**geometry**

The slope of 2x-y=5 is 2 So the slope of a perpendicular line is -1/2 kx^2 + 10xy + 8y^2 = 0 is supposed to be the intersection of 2 straight lines, so let's solve it for y y = (-10x ± √(100x^2 - 32kx^2) )/16 = (-10x ± x√100-68k)/16 = x(-10 &...
*Saturday, March 2, 2013 at 8:09am*

**math**

Do you know how to find the common denominator? If not study this site. https://www.khanacademy.org/math/arithmetic/fractions/Equivalent_fractions/v/finding-common-denominators
*Thursday, February 28, 2013 at 5:12pm*

**MATH**

An arithmetic student needs at least a 70% average to receive credit for the course. If she scored 86%, 77%, and 64% on the first three exams, what is the lowest score she can get on the fourth exam to receive credit for the course?
*Sunday, February 24, 2013 at 9:23pm*

**maths-ARITHMETIC PROGRESSIONS**

A person buys a refrigerator for rupees 12000. He pays rupees 6000 in cash and agrees to pay the balance in 12 annual instalments of rupees 500 each. If the rate of interest is 12% and he pays it with instalments on the unpaid amount, how much did the refrigerator cost him
*Sunday, February 24, 2013 at 2:29am*

**math**

let the total be x (x = men+women+children) 1/4 of x are men, so (3/4)x is made up women and children but (2/5)((3/4)x = 132 (3/10)x = 132 3x = 1320 x = 440 so the total was 440, of which 110 were men, and 132 were women, leaving 198 children check my arithmetic and my thinking.
*Thursday, February 21, 2013 at 10:34pm*

**precalc**

Determine the 8th term of the following arithmetic sequence. -7, 2, 11, 20...
*Wednesday, February 20, 2013 at 11:33am*

**math**

Find the arithmetic sequence if the fourth term is -6 and the eleventh term is -34
*Tuesday, February 19, 2013 at 3:15pm*

**Arithmetic**

what does adding 1,2,5 have to do with the original numbers? The sequence could be 1,2,3 12,2,-8 -20,2,24 or lots of others.
*Tuesday, February 19, 2013 at 11:59am*

**Math**

1st term = x 2nd term = x-.5 3rd term = x - 2(.5) .... 10th term = x - 9(.5) = x - .45 ... 14th term = x - 13(.5) = x - 6.5 t th term = x - (t-1)(.5) I assume you are studying sequences and series. Do you recognize the arithmetic sequence pattern ?
*Tuesday, February 19, 2013 at 9:49am*

**Arithmetic**

three numbers in an arithmetic sequence sum up to six. if you add 1 to the first number, 2 to the second number, and 5 to the third number, what are the orginal three numbers?
*Tuesday, February 19, 2013 at 5:49am*

**ap calc**

I will read that as v(t) = (2π - 5)t - sin(πt) = 2πt - 5t - sin(πt) a(t) = 2π - 5 - πcos(πt) for a min of a , a ' (t) = 0 π^2 sin(πt) = 0 sin(πt) = 0 πt = 0 or πt = π or πt = 2π t = 0 , t = 1 , t = ...
*Monday, February 18, 2013 at 12:07am*

**invest**

You budget $100 for parking each month. Each day you use the downtown parking lot, it costs you $5. Write a rule to represent the amountof money left in your monthly budget as an arithmetic sequence. How much money is left in your budget after you have used the downtown ...
*Sunday, February 17, 2013 at 10:05pm*

**Algebra**

invest $ 3000 and save $100 each month. Write a rule to represent the total amount of money invest into your account as arithmetic sequence. How much money will you have invested after 12 month?
*Sunday, February 17, 2013 at 9:31pm*

**math**

let A = logax ---> x = a^A let B = logay ---> y = a^B let C = logaz ---> z = a^C but we are told that logax , loga y , and loga z form an arithmetic sequence so A , B, and C form an arithmetic sequence and B-A = C-B do x, y, and z form a geometric sequence ? if so , ...
*Saturday, February 16, 2013 at 8:03am*

**math**

what formula use in solving or finding for the 9th term of a number in arithmetic series and sequences?
*Saturday, February 16, 2013 at 6:48am*

**math**

what method i need to use in solving arithmetic and geometric sequences and series?
*Saturday, February 16, 2013 at 6:44am*

**arithmetic**

Right.
*Friday, February 15, 2013 at 2:18pm*

**arithmetic**

the $225 per decameter. if you multiply the 24.75 timesten you get Way high than $225
*Friday, February 15, 2013 at 2:00pm*

**arithmetic**

The city counsel is trying to buy fencing the size of 740 meters. One fencing company is offering $24.75 per meter another is offering $225 per decameter. Which is the better buy???
*Friday, February 15, 2013 at 1:56pm*

**algebra 1**

h(3) = -9.8(9) + 30(3) + 1.5 = 3.3 I don't have the foggiest clue how you came up with -195.8 I tried different permutations of the arithmetic, but no luck.
*Friday, February 15, 2013 at 12:21pm*

**math**

let's look at the first few terms 2(1!) = 2 2(2!) = 4 2(3!) = 12 2(4!) = 48 2(5!) = 240 2(6!) = 1440 2(7!) = 10080 2(8!) = 80640 2(9!) = 725760 2(10!) = 7257600 2(11!) = .....3600 , since we are only concerned about the last 3 digits 2(12!) = ..... 3200 2(13!) = ... 1600 2...
*Wednesday, February 13, 2013 at 11:27am*

**algebra**

Value = 1250(.9)^n does that look arithmetic or geometric to you ?
*Tuesday, February 12, 2013 at 5:52pm*

**algebra**

Robin bought a computer for $1,250. It will depreciate, or decrease in value, by 10% each year that she owns it. a) Is the sequence formed by the value at the beginning of each year arithmetic, geometric, or neither? Explain. b) Write an explicit formula to represent the ...
*Tuesday, February 12, 2013 at 5:34pm*

**maths**

Consumer arithmetic teaches students how to handle money.
*Tuesday, February 12, 2013 at 1:27pm*

**maths**

what is a simple definition of consumer arithmetic for a 7th grader
*Tuesday, February 12, 2013 at 1:20pm*

**algebra**

your first sequence looks geometric with a = 81, r = 1/3 term(15) = ar^14 = 81(1/4782969) = 1/59049 2. let the missing term be x then x/39 = 975/x x^2 = 38025 x = ± √38025 = ± 195 could be 195 or -195 3. looks arithmetic with a = -5 , d = 5 term(n) = 65 -5...
*Tuesday, February 12, 2013 at 12:29pm*

**Math**

A rather lengthy question, let's find the intersection points. 1st and 2nd line: 3x+2y=1 3x+2(x-2) = 1 5x = 5 x=1 , then y = 1-2 = -1 ----> point A(1,-1) 2nd and 3rd: 4x - 9y = -22 4x - 9(x-2) = -22 -5x = -40 x = 8 , then y = 2-8 = -6 ----> point B(5,-6) 1st and 3rd...
*Tuesday, February 12, 2013 at 12:14pm*

**algebra**

I have 3 questions I need help with. 1) what is the 15th term of the sequence 81,27,9,... 2) what is a possible value for the missing term of the geometric sequence 39,_,975,_ 3) what is the sum of the finite arithmetic series (-5)+0+5+10+..+65
*Tuesday, February 12, 2013 at 11:29am*

**Math (Pre-Cal)**

There is exactly one triangle the length of whose sides are integers in arithmetic progression and whose area is 156 square units. Find the perimeter of this triangle.
*Monday, February 11, 2013 at 7:57pm*

**Calculus**

P ' (t) = (80t)(.86^t)(ln .86) + 80(.86^t) , using the product rule and knowing that d(.86^t)/dt = ln(.86)(.86^t) so if t = 5 P ' (5) = (400)(.86^5)(ln.86) + 80(.86^5) = appr 9.25 people/day check my arithmetic and calculator work
*Monday, February 11, 2013 at 11:43am*

**arithmetic**

let the number in the group be x 24x + 6 = 25x - 3 -x = -9 x = 9 cost = 24(9) + 6 = 222 , just like Ms Sue said.
*Monday, February 11, 2013 at 11:34am*

**arithmetic**

$222
*Monday, February 11, 2013 at 11:31am*

**arithmetic**

A group of friends are planning a road trip. If they all contributed $24, then they would be $6 short of the total. If they all contributed $25, then they would have $3 more than needed. What is the total cost of the trip?
*Monday, February 11, 2013 at 11:08am*

**math**

you want the sum of the 1st 12 terms of the sequence 1,3,5,7,... Now just from experience, we know that the sum of the 1st n odd numbers is n^2, so there will be 144 people present. Or, solving algebraically, we have an arithmetic sequence with a=1, d=2 S12 = 12/2 (2*1 + 11*2...
*Monday, February 11, 2013 at 10:18am*

**maths**

smallest sum is 10, largest sum of 600 since all possible sums between are possible, all we have to do is find which term number 600 is of the arithmetic sequence with term1 = 10 , d = 1, term(n) = 600 a + (n-1)d = term(n) 10 + n-1 = 600 n-1 = 590 n = 591 There are 591 ...
*Sunday, February 10, 2013 at 8:20am*

**Pre-calculus **

a) A particular ball always rebounds 3/5 the distance it falls. If the ball is dropped from a height of 5 meters, how far will it travel before coming to a stop? Explain the reasoning. b) Prove that if a1, a2, a3, ... is a geometric sequence,then ln(a1), ln(a2), ln(a3)... is ...
*Saturday, February 9, 2013 at 4:50pm*

**Math**

The sixth term of an arithmetic progression is 265 and the sum of the first 5 terms is 1445. Find the minimum value of n so that the sum of the first n terms is negative.
*Saturday, February 9, 2013 at 12:28pm*

**arithmetic**

a(n) = a₁ +(n-1)d a(6) = a₁ +(6-1)d=12 a(8) = a₁ +(8-1)d=22 a₁ +5d=12 a₁ +7d=22 a₁ = -13 d=5 a(2) = a₁ +(2-1)d= =-13 +5= =-8
*Saturday, February 9, 2013 at 10:49am*

**arithmetic**

determine the secon termof an A.P whose sixth term is 12 and eighth term is 22?
*Saturday, February 9, 2013 at 9:48am*

**math**

rats! still bad arithmetic 7+17=24, not 25 you fix it
*Friday, February 8, 2013 at 10:39am*

**Mathematics**

The 3rd and 8th term of an arithmetic progression A.P are -9 and 26.what their common difference nd first term?
*Thursday, February 7, 2013 at 11:51pm*

**arithmetic (incomplete)**

What process do you go through to get the answer, 23? Addition? Subtraction? Division?
*Thursday, February 7, 2013 at 5:35pm*

**arithmetic**

What number is 7 more than another number their answer is 23 Find the numbers.
*Wednesday, February 6, 2013 at 8:09pm*

**pre-calculus**

e^x (x^3 - 4) = 0 e^x = 0 x = -oo x^3 = 4 x = 4^(.333....) Not sure if you do complex arithmetic 360/3 = 120 if so you also have two complex roots one at +120 degrees and one at - 120 x = r (cos 120 + i sin 120) x = 4^(1/3) ( -.5 + i sqrt3/2) x = 4^.3333...(.5)(-1+isqrt 3) and...
*Tuesday, February 5, 2013 at 9:01pm*

**math**

the average (arithmetic mean) of a and b is 6 and the average of a, b, c is 11. What is the value of c?
*Tuesday, February 5, 2013 at 7:53pm*

**geometry**

http://www.mathwarehouse.com/arithmetic/numbers/list-of-perfect-squares.php
*Monday, February 4, 2013 at 2:27pm*

**Maths**

we can get CD by getting the CR using geometric sequence since the common ratio (CR) & common diff (CD)are the same... so, A sub 6=A sub 1 r^(n-1) 96=3r^5 r^5=32 r=2-------> CD is also 2 THEN, the first 5 terms of an arithmetic sequence using CD of 2 are: 3, 5, 7, 9, 11
*Sunday, February 3, 2013 at 4:43pm*

**Maths**

1..The first 2 terms of a geometric progression are the same as the first two terms of an arithmetic progression.The first term is 12 and is greater than the second term.The sum of the first 3 terms od the arithmetic progression is 4/3 less than the sum of the first 3 terms of...
*Sunday, February 3, 2013 at 4:35pm*

**Maths**

Eric thinks of 2 sequences.One is geometric and the other arithmetic.Both sequences start with the number 3.The common ratio of the geometric sequence is the same as the common difference of the arithmetic sequence.If the 6-th term of the geometric sequence is 96.Find the ...
*Sunday, February 3, 2013 at 4:27pm*

**geometry**

let the point be P(x,y) √((x-3)^2+y^2) = 1.5(x-4/3) square both sides (x-3)^2 + y^2 = (9/4)(x^2 - 8x/3 + 16/9) x^2 - 6x + 9 + y^2 = 9x^2/4 - 6x + 4 4x^2 - 24x + 36 + 4y^2 = 9x^2 - 24x + 16 5x^2 - 4y^2 = 20 or x^2 /4 - y^2 /5 = 1 , which is a hyperbola check my arithmetic
*Sunday, February 3, 2013 at 4:01pm*

**Maths**

An arithmetic and a geometric sequence have the same first terms.(2)....and the same second term say X..The sum of the first 3 terms of the arithmetic sequence equals to the third term of the geometric sequence.Calculate the first 3 terms of each sequences
*Sunday, February 3, 2013 at 12:08pm*

**maths**

A(8,-19,10) is a point on the first line and B(15,29,5) is a point on the second line vector AB = (7,48,-5) the second line has direction v = (3,8,-5) so the projection of vectorAB on u = AB·v/|v| = (21 + 384 + 25)/√(9 + 64 + 25) = 430/√98 = 430/(4√2...
*Sunday, February 3, 2013 at 11:59am*

**PLEASE HELP TANGENTS AND CIRCLES PROBLEM GEOMETRY**

circle A at bottom circle B at upper right circle C at upper left side of triangle at upper right = x so (1/2) of the bottom is x/2, draw vertical altitude through top of triangle and center of circle A NOW draw line through centers of circles A and B extending beyond at both ...
*Saturday, February 2, 2013 at 4:04pm*

**calculus 2**

by definition sinh(x) = (e^x - e^-x)/2 so the area = ∫sinh(x) dx from 0 to 1 = ∫(e^x - e^-x)/2 dx from 0 to 1 = [ e^x + e^-x)/2] from 0 to 1 = (e^1 + e^-1)/2 - (e^0 + e^0)/2 = (e + 1/e)/2 - (1+1)/2 = e/2 + 1/(2e) - 1 = (e^2 + 1 - 2e)/(2e) = (e - 1)^2 / (2e) you ...
*Friday, February 1, 2013 at 10:35pm*

**To Jessica**

I have now corrected two of your replies in which you gave incorrect solutions. Unless you know what you are doing, please don't answer any questions dealing with topics not familiar to you . I know everybody makes mistakes, I make my share, but those are usually typos or ...
*Thursday, January 31, 2013 at 9:56pm*

**calculus**

At first it might look difficult to find the intersection by setting sin(πx/2) = x^2 - 2x , but a quick sketch makes it quite easy. the period of the sin curve is 2π/(π/2) = 4 making x-intercepts of 0, 2, and 4 the parabola y - x^2 - 2x has x-intercepts of 0 and...
*Wednesday, January 30, 2013 at 8:20pm*

**Calculus**

the intersect at (0,0) and (2,4) since we are rotating around the y axis we need the radius squared, that is, we need the x^2 of each equation from the 1st : y = 2x --> x = y/2 , then x^2 = y^2/4 from the 2nd: y = x^2 ---> then x^2 = y , the outer so volume = π&#...
*Wednesday, January 30, 2013 at 8:11pm*

**math**

be found arithmetic series 3a2-a6=-a2 a3+a4=19
*Tuesday, January 29, 2013 at 6:27pm*

**math**

3___,___,20 (arithmetic)
*Tuesday, January 29, 2013 at 5:39pm*

**arithmetic**

AM=(3+5+7+9+11)/5 AM=7 Just find the average of the terms.
*Tuesday, January 29, 2013 at 6:43am*

**arithmetic progression**

a=7,a+9d=2(a+d),9d+a=2a+2d,7d=9,7d= 7,d=1,19th term=a+18d=7+18(1)=25
*Tuesday, January 29, 2013 at 4:24am*

**6th grade math**

These sites should help. http://www.mathsisfun.com/numbers/ratio.html http://www.mathsisfun.com/algebra/proportions.html https://www.khanacademy.org/math/arithmetic/rates-and-ratios/ratios_and_proportions/v/ratio-and-proportion http://www....
*Monday, January 28, 2013 at 10:16pm*

**Math**

The following arithmetic questions are correct : 1 3 4 5 8 11 12 13 15 18 19 20 #10 -- I would say all of the above #2 -- I live in Canada, so I should not comment on US practice #6 #7 , no idea since we have universal health care where 100% of hospital etc is covered . #9 - ...
*Monday, January 28, 2013 at 1:52pm*

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