Saturday
April 19, 2014

Homework Help: 1st Grade

Post a New Question | Current Questions

Trigonometry
Mountain Descent A road sign at the top of a mountain indicates that for the next 4 miles the grade is 12%. Find the angle of the grade and the change in elevation for a car descending the mountain.
Monday, February 4, 2013 at 1:45am

Community technical college
Given that 1st term of an A.P is 7 and it's 10th term is twice the second term,calculate the (a) 19th term (b)sum of 28 terms (c) difference between 9th and 6th terms
Sunday, February 3, 2013 at 9:16am

math
franklin school has 3 boys for every 4 girls in the fifth grade.there is 140 students in the fifth grade. A. how many are boys and how many are girls??? pleassseee helpppp meeeeee!!!!
Saturday, February 2, 2013 at 12:12pm

Algebra
1st odd integer ---- n next odd integer --- n+2 n + n+2 = 24 2n+2 = 24
Thursday, January 31, 2013 at 9:42pm

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

Algebra
x+y = 19 x-y = 55 add them 2x = 74 x = 37 in 1st ---> 37+y=19 y = -18 the numbers are -18 and 37
Wednesday, January 30, 2013 at 7:07pm

4th grade math
In helping my 4th grade grandson last night with his math, he had problems like this 93 * 18. I asked what the asterisk meant and he said the teacher said to "figure it out"
Wednesday, January 30, 2013 at 11:38am

Math 8R - HELP!
I would use substitution sub the 1st into the 2nd 4x - y = -2 4x - (2x) = -2 2x = -2 x = -1 then back into the first y = 2x y = 2(-1) = -2
Tuesday, January 29, 2013 at 9:09pm

physics
For the 1st leg of the run: velocity(ave) = displacement/time= 750/20=37.5 m/s For the total trip: velocity(ave) = displacement/time= 0 speed (ave) = distance/time= 1500/45 =33.3 m/s
Tuesday, January 29, 2013 at 6:31am

Math
There are 12 girls on a gymnastics team. Less than 1/4 of the girls are in second grade. How many girls on the gymnastics team could be in second grade?
Monday, January 28, 2013 at 9:00pm

algebra
plug the 2nd into the 1st 5(2-3y) + 8y = -4 10 - 15y + 8y = -4 -7y = -14 y = 2 plug into the 2nd to get x looks like one solution , which was not one of your possible choices
Sunday, January 27, 2013 at 9:16am

Pre-Calculus
first, I'd get rid of those pesky fractions: 2x + 3y = -1 3x - y = 4 Now you can see that y = 3x-4, so substitute that back in the 1st equation: 2x + 3(3x-4) = -1 2x+9x-12 = -1 11x = 11 x = 1 so, y=3x-4 = -1 be sure to check that the answer fits the original equations.
Wednesday, January 23, 2013 at 1:01pm

math
I need to solve this problem. A teacher can grade 25 papers in 4 hours. How many papers can he grade in 6 hours?
Tuesday, January 22, 2013 at 5:58pm

algebra 1
Whether to use substitution or elimination becomes a judgement call. Sometimes one is easier, at other times not. e.g. 2x + y = 15 3x +7y = 12 In this case , change the first to y = 15-2x and use substution, clearly easier e.g 3x + 5y = 9 4x - 3y = 20 Here I would NOT use ...
Monday, January 21, 2013 at 5:10pm

Chemistry
This problem is 1st order for half life. How long would it take for the concentration of cyclopropane to decrease to 50% of its initial value? to 25% of its initial value? Rate constant is 9.2/s I set up like this... t1/2= 0.693/9.2/s= 0.075s at 50% I can't figure out how ...
Monday, January 21, 2013 at 9:53am

Chemistry
What would be the concentration of dinitrogen pentoxide after 6.00 X 10(2) seconds and how long would it take for the concentration of N2O2 to decrease to 10.0% of its initial value in the following equation... N2O5 to NO2 and O2 initial concentration is 1.65 X 10-2mol/L rate ...
Sunday, January 20, 2013 at 8:54pm

Pre Calculus 12 urgent
The coefficients are 1 7 21 35 35 21 7 1 So, the 6th term is (21)(1/2 x)^2 (-y)^5 = -21/4 x^2 y^5 The 4th term has y^3 In the expansion, the n+1st term is C(7,n) (1/2 x)^n (-y)^(7-n)
Friday, January 18, 2013 at 10:37am

Math
I was basically an English and social studies teacher in 7th and 8th grade. Occasionally, I also taught classes in 7th grade math. I taught in a small district in Michigan for 32 years.
Thursday, January 17, 2013 at 7:50pm

Calculus
your 1st answer is correct #2. x(1/2 + √3/2 i) = 3+3i√3 x = (3+3√3 i))/[1/2 (1+√3 i)] now rationalize by multiplying by conjugate x = 3(1+√3 i)* 2(1-√3 i)/(1-3) x = -3(1+√3 i))(1-√3 i) x = -3(1-3) x = 6
Tuesday, January 15, 2013 at 2:21pm

Calculus
In these complex exponential problems, solve for x: 1)e^(i*pi) + 2e^(i*pi/4)=? 2)3+3=3i*sqrt(3)=xe^(i*pi/3) MY attempt: I'm not really sure of what they are asking. For the 1st one I used the e^ix=cos(x)+i*sin(x) and got -1+sqrt(2) +sqrt(2)i 2) I solved for x and fot (3+3i...
Tuesday, January 15, 2013 at 2:08pm

math
sub the 2nd into the 1st 4x + 9((1/3)x+2) = 24 4x + 3x + 18 = 24 7x = 6 x = 6/7 then y = (1/3)(6/7) + 2 = 16/7 x = 6/7 , y = 16/7
Tuesday, January 15, 2013 at 10:21am

2nd grade
I'm in 6th grade, the answer is 4, the reason is because, 20 divided by 4=5 and 5x4=20, so the answer is,4.
Monday, January 14, 2013 at 7:45pm

Math
after 1st breath , diameter = 5cm after 2nd breath , diamieter = 1.2(5) = after 3rd breath, diameter = 5(1.2)^2= (this question is physically unrealistic, Mary would be inserting the same amount of volume, which would show up with smaller and smaller increases in the diameter...
Sunday, January 13, 2013 at 9:46pm

math
total time at 20 km/h = 40 km/ 20 km/h = 2 hours time of 1st part = 10/30 = 1/3 hr = 20 minutes time of 2nd part = 30/15 = 2hours for a total of 2:20 hrs so it would take him 20 minutes extra
Saturday, January 12, 2013 at 5:43pm

Algebra 1
Whenever you have a variable showing up as an x or y with coefficient of 1 understood, I use substitution from the 2nd , x = 2 - 3y, now plug into the 1st 2(2-3y) + 5y = 8 4 - 6y + 5y = 8 -y = 4 y = -4 then x = 2 -3(-4) =14 x= 14 , y = -4
Thursday, January 10, 2013 at 11:09pm

math
please check: 10 to the 1st power = 10*1??? 10 to the 0 power = 10*0??? I'm not sure.
Wednesday, January 9, 2013 at 5:24pm

Math
think of an arithmetic sequence where a=60 and d=1. The sum of the 1st 21 terms is thus 21/2(2*60+20*1) = 1470 or, since each number is 20 more than the terms of the first sequence, add 21*20 = 400, to get 1470
Wednesday, January 9, 2013 at 11:03am

MAth
The seat count forms an arithmetic sequence 25,27,29... where a = 25, d=2 The sum of the 1st 20 terms is thus S20 = 20/2 (2*25 + 19*2) = 880
Wednesday, January 9, 2013 at 10:58am

math
rate of 1st bucket =1/6 buckets/minutes rate of 2nd bucket = 1/4 buckets/minutes combined rate= 1/6+1/4 or 5/12 buckets/minutes time taken = 1/(5/12) = 12/5 or 2.4 minutes
Monday, January 7, 2013 at 10:02pm

Statistic- Average
A mean average of 60 on 6 exams is needed to pass a course. on his first 5 exams, Adam received grades of 46,73,73,63 and 70. If the lowest grade of the exams already taken is to be dropped, what grade must he receive on his last exam to get a C in the Course?
Monday, January 7, 2013 at 6:23pm

statistics-?mean average with lowest number out?
A mean average of 60 on 7 exams is needed to pass a course. on his first 6 exams, Adam received grades of 46,74,70,59,66 and 72. if his lowest grade of the exams already taken is to be dropped,what grade must he receive on his last exam to pass?
Monday, January 7, 2013 at 3:26pm

statistics-?mean average with lowest number out?
A mean average of 60 on 7 exams is needed to pass a course. on his first 6 exams, Adam received grades of 46,74,70,59,66 and 72. if his lowest grade of the exams already taken is to be dropped,what grade must he receive on his last exam to pass?
Monday, January 7, 2013 at 2:46pm

math
A mean average of 60 on 7 exams is needed to pass a course. on his first 6 exams, Adam received grades of 46,74,70,59,66 and 72. if his lowest grade of the exams already taken is to be dropped,what grade must he receive on his last exam to pass?
Monday, January 7, 2013 at 2:02pm

Algebra
1st times 8 ----> p + 6q = 56 or p = 56-6q 2nd times 2 ---> 3p - 2q = 8 3(56-6q) - 2q = 8 168 - 18q - 2q = 8 -20q = -160 q = 8 then p = 56-6(8) = 8 p= 8 and q = 8 Notice how for both of your last two posts, I got rid of fractions to make the equations much more manageable.
Sunday, January 6, 2013 at 11:19pm

math
1st of all its easier if u turn the fractions to improper frac. 16/3- 63/18 then, u get the least common ddenominator which is 18 then,your equation should be 96/18- 63/18 then subtract since the 2nd fraction is negative.... and you get 33/18 or 1 and 5/6 hope this helped:)
Friday, January 4, 2013 at 5:08am

Can someone help me?!
The 1st, 5th and 13th terms of an arithmetic sequence are the first three terms of a geometric sequence with a common ratio 2. If the 21st term of the arithmetic sequence is 72, calculate the sum of the first 10 terms of the geometric sequence.
Thursday, January 3, 2013 at 6:06pm

math
how would i find the sum of the 7 term. if i have 1st term = 11 and 7th term = 704.its a geometric series. i dont know how to find the difference?
Wednesday, January 2, 2013 at 7:05pm

Algebra
4) already did this: independent dependent if the lines are parallel 6) look at the coefficients! 1st set matches 7) already did this: reflect across the x-axis, translate 3 units to the right, translate up 2 units 15) think about it: every 68 hours it divides in half. So, the...
Wednesday, January 2, 2013 at 2:14pm

maths
Engineering -- E Science ------ S Prob (E is picked from 1st group) = 3/8 prob(E is picked from the 2nd group) = 5/8 first picking is determined by a die toss of 3 or 5 which has a prob of 2/6 or 1/3 2nd picking is determined by any other die toss which is 2/3 prob of your ...
Friday, December 28, 2012 at 8:27am

algebra
sub the 2nd into the 1st 3y = (1/2)x + 2 3(x+9) = (-1/2)x + 2 3x + 27 = (-1/2)x + 2 times 2 to get rid of that nasty fraction 6x + 54 = -x + 4 7x = -50 x = -50/7 then y = x+9 = -50/7 + 9 = 13/7 check: in #1: 3y = (-1/2)x + 2 LS = 3(13/7) = 39/7 RS =(-1/2)(-50/7) + 14/7 = 25/7...
Saturday, December 22, 2012 at 12:57am

algebra URGENT!
1st: add them 3x = -9 x = -3 back into #2 -3 + 2y = -1 2y = 2 y = 1 2nd: add them 6x = 42 x = 7 in the 2nd: 21 + y = 14 y = -7
Saturday, December 22, 2012 at 12:49am

maths --plse help me..
cost: 300/12 * 50 = 1250 12% profit = 150 so, he needs total sales of 1400 1st 200: 200/10 * 50 = 1000 the remaining 100 apples must sell for 400, or Rs40 each
Friday, December 21, 2012 at 3:07pm

World history- does this sound okay?
if you had to give queen Elizabeth the first a grade on the enlightenment principles what grade would you give and why? I think I would give her a B bc for the most part she was a very big influence on the enlightenment era and she enabled quite a bit for us today. she changed...
Thursday, December 20, 2012 at 2:33pm

physics
v1=a1•t1=5.9•4=23.6 m/s v2= a2•t2 = 4.4•6.5 = 28.6 m/s τ1 =s/v1 =200/23.6=8.47 s. τ2 =s/v2 =200/28.6=6.99 s the total time for the 1st runner 4+8.47 = 12.47 s. fir the 2nd runner 6.5+6.99 = 13.49 s
Thursday, December 20, 2012 at 10:40am

physics
2 runners accelerate from rest to their top speeds. The 1st runner pat has an acceleration of 5.9 m/s^2 and reaches her top speed in 4 sec. The second runner steven accelerates at 4.4m/s^2 and takes 6.5 sec to reach his top speed the 2 runners run flat out for the remainder of...
Thursday, December 20, 2012 at 10:00am

5th grade
i am actually in 5th grade.... actually exponients are not that difficult normalised is actually simplified to the definition of 10000,00000.
Wednesday, December 19, 2012 at 10:10pm

Math
let the middle number be x then the 1st is x-2 and the 3rd is x+2 (x-2)^2 + x(x+2) = 224 x^2 - 4x + 4 + x^2 + 2x = 224 2x^2 -2x - 220 = 0 x^2 - x - 110 = 0 (x-11)(x+10) = 0 x = 11 or x = -10, but x is to be odd so x = 11 and the three numbers are 9, 11, and 13 check: 9^2 + 11(...
Wednesday, December 19, 2012 at 10:00pm

ECC
When do parents start to socialize their children in earnest? 1) The 1st year when babies can interact socially. 2) The 2nd year when toddlers are first able to comply with parental directions. 3) The preschool years when children start formal schooling. 4) Early adolescence ...
Wednesday, December 19, 2012 at 9:37pm

calculus
Your function is a simple parabola All parabolas have one turning point, called the vertex because of the + understood in front of f(x) = +x^2 .... the parabola opens upwards so it rises to infinity in both the 1st and 2nd quadrants. If the function had been f(x) = -x^2...
Tuesday, December 18, 2012 at 9:51pm

Grading
How do you find out what your grade is on a paper? For example if there is 70 questions and you miss 10 how do you find out what your grade is? Do you subtract 70 and 10 and when you get your answer you divide it by 100?
Tuesday, December 18, 2012 at 7:28pm

algebra
from the 2nd: x = 3y+6 sub into 1st 9(3y+6) - 6y = -30 27y +54 - 6y = -30 21y = -84 y= -4 then x = 3(-4) + 6 = -6 x=-6 , y = -4
Monday, December 17, 2012 at 9:59pm

3rd grade math
Help me on that question people!!!
Monday, December 17, 2012 at 6:17pm

Math
I haven't learned any of this with π incorporated into it. I think my teacher mentioned that we do it in grade 12? Radians and such... I'm in grade 11 though. This question is straight out of the textbook so I guess they did do that.. And they actually mix units ...
Sunday, December 16, 2012 at 5:16pm

Chemistry :(
Why posting the question that only need High School grade to answer? Are you Junior High School student or lower grade? If you have no intention to put some effort in your study from the start, no need to enroll and then cheat.
Sunday, December 16, 2012 at 10:51am

chemistry
Why posting the question that only need High School grade to answer? Are you Junior High School student or lower grade? If you have no intention to put some effort in your study from the start, no need to enroll and then cheat.
Sunday, December 16, 2012 at 10:50am

Chemistry
Why posting the question that only need High School grade to answer? Are you Junior High School student or lower grade? If you have no intention to put some effort in your study from the start, no need to enroll and then cheat.
Sunday, December 16, 2012 at 10:50am

Science
Why posting the question that only need High School grade to answer? Are you Junior High School student or lower grade? If you have no intention to put some effort in your study from the start, no need to enroll and then cheat.
Sunday, December 16, 2012 at 10:49am

Math
I assume you are solving. from the 2nd: x = 2y-3 sub into the 1st (2y-3)^2 + y^2 - 37 = 0 4y^2 - 12y + 9 + 9y^2 - 37 = 0 13y^2 - 12y - 28 = 0 (y-2)(13y + 14) = 0 y = 2 or y = -14/13 if y = 2, then x = 2-3 = -1 if y = -14/13, x = -28/13 - 3 = -67/13 points of intersection: (-1,...
Tuesday, December 11, 2012 at 11:26am

Math
sum of 1st 7 odds is 7^2 = 49 so, if you start with 2k+1 instead of 1, then each odd number is increased by 2k, so you wind up with 7*2k + 49 check: let k=5 and you have 11+13+15+17+19+21+23 = 119 = 7*10+49
Monday, December 10, 2012 at 3:59pm

Real Estate Finance
1st Month:I = Po*r*t r = (8%/12) / 100% = 0.0066666 = Monthly % rate expressed as a decimal. t = 1 month. I = 100000*0.0066666*1 = $666.67. P = 733.76 - 666.67 = $67.09 = Amt applied to Po. Bal. = 100000 - 67.09 = $99,932.91.
Monday, December 10, 2012 at 3:00pm

Real Estate Finance
1st Month:I = Po*r*t r = (8%/12) / 100% = 0.0066666 = Monthly % rate expressed as a decimal. t = 1 month. I = 100000*0.0066666*1 = $666.67. P = 733.76 - 666.67 = $67.09 = Amt applied to Po. Bal. = 100000 - 67.09 = $99,932.91.
Monday, December 10, 2012 at 3:00pm

Real Estate Finance
1st Month:I = Po*r*t r = (8%/12) / 100% = 0.0066666 = Monthly % rate expressed as a decimal. t = 1 month. I = 100000*0.0066666*1 = $666.67. P = 733.76 - 666.67 = $67.09 = Amt applied to Po. Bal. = 100000 - 67.09 = $99,932.91.
Monday, December 10, 2012 at 3:00pm

Real Estate Finance
1st Month:I = Po*r*t r = (8%/12) / 100% = 0.0066666 = Monthly % rate expressed as a decimal. t = 1 month. I = 100000*0.0066666*1 = $666.67. P = 733.76 - 666.67 = $67.09 = Amt applied to Po. Bal. = 100000 - 67.09 = $99,932.91.
Monday, December 10, 2012 at 2:59pm

Real Estate Finance
1st Month:I = Po*r*t r = (8%/12) / 100% = 0.0066666 = Monthly % rate expressed as a decimal. t = 1 month. I = 100000*0.0066666*1 = $666.67. P = 733.76 - 666.67 = $67.09 = Amt applied to Po. Bal. = 100000 - 67.09 = $99,932.91.
Monday, December 10, 2012 at 2:59pm

Real Estate Finance
1st Month:I = Po*r*t r = (8%/12) / 100% = 0.0066666 = Monthly % rate expressed as a decimal. t = 1 month. I = 100000*0.0066666*1 = $666.67. P = 733.76 - 666.67 = $67.09 = Amt applied to Po. Bal. = 100000 - 67.09 = $99,932.91.
Monday, December 10, 2012 at 2:59pm

Real Estate Finance
1st Month:I = Po*r*t r = (8%/12) / 100% = 0.0066666 = Monthly % rate expressed as a decimal. t = 1 month. I = 100000*0.0066666*1 = $666.67. P = 733.76 - 666.67 = $67.09 = Amt applied to Po. Bal. = 100000 - 67.09 = $99,932.91.
Monday, December 10, 2012 at 2:58pm

Real Estate Finance
1st Month:I = Po*r*t r = (8%/12) / 100% = 0.0066666 = Monthly % rate expressed as a decimal. t = 1 month. I = 100000*0.0066666*1 = $666.67. P = 733.76 - 666.67 = $67.09 = Amt applied to Po. Bal. = 100000 - 67.09 = $99,932.91.
Monday, December 10, 2012 at 2:57pm

math
her speed on flat ground --- x mph effect of hill -------------- y mph (11/60)((x+y) = 4.8 11x + 11y = 288 (14/60)(x-y) = 4.8 14x - 14y = 288 1st time 14 ---> 164x + 154y = 4032 2nd times 11 --> 154x - 154y = 3168 add them 318x = 7200 x = 22.64 sub into 11x + 11y = 288 ...
Sunday, December 9, 2012 at 10:03pm

Math
A curve has equation y= 2 + x - x^2. Find coordinates of 3 unknown points on the line. 1st point is at negative x, y value. 2nd point is at x=0 and y is positive. 3rd value is at y=o and x is positive.
Sunday, December 9, 2012 at 3:16pm

Math challenge
There are 3 circles divided into thirds with a number in each third. The 1st cirlcle has 18, 23 & 49. 2nd cirlce has 25, 62, 38. The 3rd cirlce has ?, 17 & 39. We need to figure out what number is missing from the 3rd circle, and how you figured it out.
Thursday, December 6, 2012 at 7:55pm

Math
Elsa had a rubber disc that was red on one side and blue on the other. She tossed this disc 3 times. Draw a diagram showing all the possible outcomes she could get in 3 tosses of the same rubber disc 1st toss can be red or blue 2nd toss can be red or blue and 3rd toss can be ...
Thursday, December 6, 2012 at 7:21pm

Math
Please help! How do I find the mean weight of 2 groups of 100 kids... 1st grp mean weight is 55.7lbs and 2nd grp mean weight is 42.6lbs.
Wednesday, December 5, 2012 at 6:33pm

Math
Can someone help me to get d formular of this game?Megasena brazil.1st wk,5,19,32,41,49,58.2nd wk,6,13,24,32,40,51 and third wk,1,19,28,33,39,41.thanks.
Wednesday, December 5, 2012 at 11:26am

maths
We have the formula a+(n-1)d=nth term Where a is the 1st term ,d is the difference and n is the nth term So1st term= a 2nd term= (a+1)d 3rd term= (a+2)d 5th term=(a+4)d Adding ad+2d+ad+ 4d= 38 2ad+ 6d= 38 In the same way 7th term=(a+6)d 10th term=(a+9)d Adding these 2ad+15d=...
Monday, December 3, 2012 at 7:47am

Math
I would use elimination, where we attempt to get the coefficients of either x or y to be the same or to be opposite 1st equation --> 6x - 4y = 54 2nd times 2 --> -18x + 4y = -138 add them: -12x = -84 divide by -12 x = 7 sub back into the first 6(7) - 4y = 54 -4y = 12 y...
Sunday, December 2, 2012 at 10:25pm

Computer Science (Programming Logic And Design)
Create a program that outputs a letter grade for a student based on the following table:  From To Grade  90 100 A  80 89 B  70 79 C  0 69 F  I dont understand how to do this. Would you mind helping me get the answer to this Program?
Sunday, December 2, 2012 at 2:18pm

Computer Science (Programming Logic And Design)
Create a program that outputs a letter grade for a student based on the following table:  From To Grade  90 100 A  80 89 B  70 79 C  0 69 F  I dont understand how to do this. Would you mind helping me get the answer to this Program?
Sunday, December 2, 2012 at 2:18pm

Programming (CSI 150 Programming Logic and Design)
Create a program that outputs a letter grade for a student based on the following table:  From To Grade  90 100 A  80 89 B  70 79 C  0 69 F  I dont understand how to do this. Would you mind helping me get the answer to this Program?
Sunday, December 2, 2012 at 2:14pm

math
Suppose that you are taking a course that has three exams which count for three-fifths of your grade and a final which counts for two-fifths of your grade. On your first three tests your scores on were 75, 80, and 74. To get an B in the course, you must have an average of at ...
Sunday, December 2, 2012 at 2:11pm

Programming (CSI Programming Logic and Design)
Create a program that outputs a letter grade for a student based on the following table: From To Grade 90 100 A 80 89 B 70 79 C 0 69 F I dont understand how to do this. Would you mind helping me get the answer to this Program?
Sunday, December 2, 2012 at 2:10pm

Math .. Please help Reiny
Reiny, do u think 1st question about blankets should b written differently? For e.g. If we say b= 5, then the first part of the equation will equal 175+ 5= 80. I'm thinking it should be written as this: 25 (7+b) = 300 175 + 25b = 300 25b = 125 Pls let me know what you ...
Friday, November 30, 2012 at 12:20am

7th grade social studies Ms. Sue please
You're welcome. :-) I recognize those questions. I taught 7th grade geography.
Thursday, November 29, 2012 at 7:05pm

Algebra
cost of lodging ---x cost of golf ------ y 4x + 3y = 443.50 7x + 5y = 765.5 1st times 5 --> 20x + 15y = 2217.5 2nd times 3 --> 21x + 15y = 2296.5 subtract them x = 79 back in #1 etc
Wednesday, November 28, 2012 at 10:08pm

4th grade
what grade are all of you in like high school or collage you know i never got math intil now . do any of you like math?
Wednesday, November 28, 2012 at 5:46pm

trig
cosθ = 2/√7 and 0 <= θ <= π means we are in the 1st quadrant. so, sinθ = √(7-4)/√7 = √(3/7)
Wednesday, November 28, 2012 at 2:59pm

calculus
A multistoried building has a floor area of 2,000 square feet on the ground floor, 1,995 square feet on the 1st floor, 1,990 square feet on the 2nd floor, and so on. If the areas of the higher floors follow this sequence, what is the expression to calculate the area of the nth...
Tuesday, November 27, 2012 at 11:14am

math
what $27? I assume some senior discount 1st week: 139.90 + 63 + 3(.5(2*11.50) + (10-2)) = 261.40 other weeks cost just the taxi and the lessons: 3(.5(2*11.50) + (10-2)) = 58.50
Tuesday, November 27, 2012 at 12:15am

maths-- compound interest
business takes a loan of $40,000, set at 4% interest and will be paid off in 12 years. The bank wants to save the business money by calculatin the interest on a remaining balance basis in case he pays it off early. The annual payment si assumed to be $3500 of principal and ...
Monday, November 26, 2012 at 2:18pm

7th grade science help the solar system Ms. Sue
I was a 7th grade teacher im good at any subject except math
Monday, November 26, 2012 at 12:28pm

Math
prob of picking the right key = 2/5 prob of opening on first try = 2/5 prob of opening on 2nd try = (3/5)(2/5) = 6/25 (2nd try has to be Miss, Success) prob of 1st OR 2nd try = 2/5 + 6/25 = 16/25
Saturday, November 24, 2012 at 2:07pm

math help please
1st equation: y = (-1/4)x + 10 -----> slope = -1/4 2nd equation: -2x + 8y = 6 8y = 2x + 6 y = (2/8)x + 6/8 y = (1/4)x + 2/3 ----> slope = 1/4 so the lines are neither parallel , nor perpendicular.
Friday, November 23, 2012 at 11:03pm

math
Prob of 1 or 2 on a die = 2/6 = 1/3 prob of 2 or 4 = 1/3 prob of 5 or 6 = 1/3 Since these become your choice of answer prob of selecting 1st answer = 1/3 prob of selecting 2nd answer = 1/3 ..... so the prob of choosing the correct answer in each event is simply 1/3 so to get 7...
Tuesday, November 20, 2012 at 8:43am

math
why do you want to add more clubs is only a question to ask if they reply yes to the 1st question. I think it is pretty good topic. So, do you want us to think up some more questions?
Tuesday, November 20, 2012 at 7:59am

science, chemestry
Sulfur vapor is analyzed by photoelectron spectroscopy (PES). Measurements determine that photoelectrons associated with the 1st ionization energy of sulfur move with de Broglie wavelength λ=3.091 A˚. What is the maximum wavelength (in meters) of radiation capable of...
Sunday, November 18, 2012 at 8:40pm

science, chemestry
Sulfur vapor is analyzed by photoelectron spectroscopy (PES). Measurements determine that photoelectrons associated with the 1st ionization energy of sulfur move with de Broglie wavelength λ=3.091 A˚. What is the maximum wavelength (in meters) of radiation capable of...
Sunday, November 18, 2012 at 8:40pm

chemistry
Sulfur vapor is analyzed by photoelectron spectroscopy (PES). Measurements determine that photoelectrons associated with the 1st ionization energy of sulfur move with de Broglie wavelength λ=4.091 A˚. What is the maximum wavelength (in meters) of radiation capable of...
Sunday, November 18, 2012 at 10:54am

chemistry
Sulfur vapor is analyzed by photoelectron spectroscopy (PES). Measurements determine that photoelectrons associated with the 1st ionization energy of sulfur move with de Broglie wavelength λ=2.091 A˚. What is the maximum wavelength (in meters) of radiation capable of...
Sunday, November 18, 2012 at 6:33am

chimistry
Sulfur vapor is analyzed by photoelectron spectroscopy (PES). Measurements determine that photoelectrons associated with the 1st ionization energy of sulfur move with de Broglie wavelength λ=3.591 A˚. What is the maximum wavelength (in meters) of radiation capable of...
Sunday, November 18, 2012 at 2:23am

chemistry
Sulfur vapor is analyzed by photoelectron spectroscopy (PES). Measurements determine that photoelectrons associated with the 1st ionization energy of sulfur move with de Broglie wavelength λ=5.091 A˚. What is the maximum wavelength (in meters) of radiation capable of...
Saturday, November 17, 2012 at 11:54am

chemistry
Sulfur vapor is analyzed by photoelectron spectroscopy (PES). Measurements determine that photoelectrons associated with the 1st ionization energy of sulfur move with de Broglie wavelength λ=5.591 A˚. What is the maximum wavelength (in meters) of radiation capable of...
Saturday, November 17, 2012 at 8:29am

Pages: <<Prev | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | Next>>

Post a New Question | Current Questions

Search
Members