Math help

Math help !!!!!!!!!!!!!!!?
1. An airline had 122, 138, 114, and 133 passengers on four flights from San Diego to San Jose during 1 day. What was the total number of passengers? 2. You are fencing a backyard that measures 20 yd by 15 yd. How much fencing should you buy? 3. List all the prime numbers between 45 and 80 4. Find the prime factorization of the number 20. 5. Find two factors of 35 with a difference of 2. 6. Choose the correct greatest common factor of 28, 42, and 7. A used-car dealer sold 13 of the 52 cars in stock. What fraction names the portion sold? What fraction names the portion not sold. (Reduce fractions.) Please explain how to get the answers, Thank you
Mathematics - 7 Answers
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1 :
1. Just add up all the numbers. 507 passengers. 2. A rectangle with long side of 20yd and a short side of 15yd. You need two lengths of each side = 40 + 30 = 70yd. 3. Look at the numbers and first of all cross off the even ones. You just have to check if they are divisible by any primes that are less than the square root of the number that you are checking. Since the largest number is 85, you just have to check 2, 3, 5 and 7. That leaves the following as primes ( they don't have 2, 3, 5 or 7 (or anything else) as factors): 47 53 59 61 67 71 73 79 83 4. You can really do this by inspection. Normally you divide by the lowest prime factor that fits (such as 2 or 3) and repeat until you have a prime. With 20, that's 2 x 2 x 5. 5. Well the two obvious factors of 35 are 5 and 7 (5x7=35) and they have a difference of 2. So - solved. 6. The greatest common factor of 28 and 42. Just list the factors and pick the greatest common one. 28: 2, 4, 7, 14 42: 2, 3, 6, 7, 14, 21 It looks like you had one more number that was missing from your question. Just list the factors for that and you can easily see the greatest common factor. The greatest common factor is 14. 7. 13 / 52 = 1 / 4 (divide top and bottom by 13) The portion not sold = 1 - 1/4 = 3/4
2 :
2. the perimeter is the lenght of all the sides added together. 20 + 20 + 15 + 15 = answer 5. 7 and 5
3 :
1. Just add them all up = 507 2. Perimeter of a rectangle is 2 * length + 2 * width=2*20+2*15=70 3. A prime number is a number that has exactly 2 factors, 1 and itself. Therefore, any even number greater than 2 is not a prime. So, consider only odd numbers greater than 45 and less than 80. You only have to check for divisibility for 3, 5 and 7 because they are the only prime numbers greater than 2 and less than or equal to 8.94427 (square root of 80). 49 is divisible by 7, 51 divisible by 3, 55 divisible by 5, 57 is divisible by 3, 63 is divisible by 3, 65 is divisible by 5, 69 is divisible by 3, 75 is divisible by 5, 77 is divisible by 7. That leaves 47, 53, 59, 61, 67, 71, 73, 79 4. 20 is even so divide by 2 to get 10. Even again, divide by 2 to get 5. 5 is a prime number so 2*2*5 5. 5 and 7 6. and? I see only 2 numbers. Prime factorization of 28 is 2*2*7 and the prime factorization of 42 is 2*3*7. The common prime factors are 2 and 7. 2*7=14 7. 13/52. Divide top and bottom by 13 (gcf) to get 1/4. The unsold cars are (52-13)/52 = 39/52. Divide top and bottom by 13 (gcf) to get 3/4.
4 :
1. to get the total number of passengers, add up those on each flight. 122 + 138 + 114 + 133 = 507 2. draw a picture of the backyard. (it is a rectangle). label the short sides 15 and the long sides 20. now add up the lengths of fence you need (15 + 20 + 15 + 20) = 70 3. prime numbers have no other factors except 1. So the even numbers are no good, nor are multiples of 3, 5, or 7. Taking these out leave 47, 53, 59, 61, 67, 71, 73, 79. Since the next prime after 7 is 11 and 80 is less than 11*11, these are all prime. 4. 20 = 4 * 5 - 2*2*5. 2 and 5 are prime, so we are done. 5. 35 = 1 * 35 = 5 * 7. 7 - 5 = 2. 6. gcd(28, 42, 7) is the largest number that divides all three without remainder. since 7 is prime, the only candidates are 1 and 7. 7 divides 28 and 42 evenly and it certainly divides 7 evenly, so it is the answer. {gcd = greatest common divisor, the same thing as greatest common factor) 7. 13/52 to simplify, divide numerator and denominator by 13 to get 1/4.
5 :
1.) ADD ; 122+138+114+133=507 passengers 2) 20x2+15x2=70 yrds, buy the cheapest/yard 3) 47,51,53,57,59,61,67,71,73,79 4) 2,4,5,10 5)7 and 5 ; 7-5=2 6) 7 7) 13/52= 0.25 x 100% = 25% 39/52=0.75 x 100% = 75% whew, hope it helps
6 :
2. you are finding the perimeter of the rectangle so you add up all the sides of the rectangle 2(20 yd) + 2(15 yd)= 70 yd. 3. a prime number is a number whose factors are only itself and one, meaning it has no other factors. some prime numbers between 45 and 80 include: 47, 59, 61... 4. break the 20 into two factors (10 x 2). 2 is a prime number so you continue by factoring the 10 (5 x 2). since 5 is also a prime number the answer is: 2 x 2 x 5. when writing the answer, you should always put the smallest number first. 5. 7 and 5. because 7 x5= 35 and 7-5= 2 7. fraction of portion sold= the # sold/ the total= 13/52= 1/4 portion not sold= the # not sold/ total= (52-13)/52= 39/52= 3/4 [you can also think about this as 1-(1/4) because the portion not sold is just the rest of the cars left, 100%- 25%=75%)
7 :
1. 122+138+144+133= 507 passengers in one day. 2. P= 2L + 2W P= 2(20) + 2(15) P= 40 + 30 P= 70 yds. 3. 47, 53, 59, 61, 67, 71, 73, 79 in this case, look up all multiples of 6 between 45 and 80 then subtract or add 1 to each no., but be careful. some are still composite with this (49, 55, 65,77) 4. 2x2x5 5. 1,5,7,35, so 7 and 5 6. 28= 2x2x7 42= 2x3x7 remove the 2 from 28 and the 3 from 42 then you get 2x7 or 14! 7. 25% and 75%

I need help with finding a flight

I need help with finding a flight?
Alright so I have very specific times to be in San Jose, Costa Rica (San Juan International). I need a flight booker where I can put in these times. Ah someone give me a good site? Thanks...
Air Travel - 3 Answers
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1 :
kayak.com
2 :
I would recommend looking on Travelocity or Expedia, they usually have very good rates. Or possibly look on those airports' websites and check to see which airlines have service there. Then, check on the airlines' websites, compare, and find which is cheapest.
3 :
you should go to www.cheapflights.com

Urgent Visa Biometric Centre (ASC) Questions - California/San Jose

Urgent Visa Biometric Centre (ASC) Questions - California/San Jose?
Hi, I need to book flights in a couple of days and urgently need an answer to the following questions - only answer if you know the answer is 100% correct please: 1. I understand there is a long waiting list (a couple of weeks), in LA currently for Biometric testing for Visa applications, does this extend to all testing centres in California (San Jose is my preferred choice)? Or does anyone know a phone number I can contact to find out (1-800-375-5283 (USCIS support number) is useless)? 2. Lastly, when you apply online for the (spouse in my case) visa, I have been told it offers you the choice of biometric centres you can use, you then pay for the application, then you can pick an appointment at your biometric centre online. IF the centre you have chosen has no soon appointments, is there any way you can go back and pick a different biometrics centre? I've tried numerous forums to get this answered but am getting nothing definitive - all sound advice welcome. Thankyou.
Immigration - 1 Answers
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1 :
Did you try to go back to infopass and drop your current appointment then select a new one??? That is how it suppose to work. PS. I don`t see a clear connection between biometrics and booking a flight. If you are going to be out of town then you can do biometrics when you come back.

Have you ever taken a bus from cancun to belize or from san jose costa rica to belize

Have you ever taken a bus from cancun to belize or from san jose costa rica to belize?
I've read some online blogs about taking the busses, it seems fairly easy enough in theory, I am just wondering if anyone here has ever done it. We are two women in our mid twenties, and just want to make sure its safe. We may take a flight back, but are looking to cut down on cost, see some scenery and have an experience in the process. If you have taken the bus, how long did it take? Its esitimated at seven hours, but the busses stop often which they say will add "quite a bit" to the trip... do you know what quite a bit might mean? And finally... I know that the last stop is at the border. However, what kind of area is this? We have a friend whose family lives there and can come pick us up, but we just don't want to be stranded in the middle of nowhere until they can get there.
Other - Latin America - 1 Answers
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1 :
it is quicker from Cancun. take in the mayan ruins in guatamala

Cheap flight to Sioux Falls

Cheap flight to Sioux Falls?
I would like to find a cheap flight to Sioux Falls,SD from San Francisco or San Jose. The major websites are way out of my budget. What can I do? Would it be better to go to a travel agent? I should add that I grew up there. I'm looking to spend 3 nights/2 days there outside of travel days.
Other - United States - 2 Answers
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1 :
Your best bet is to fly into Omaha's Epply Airport and rent a car and drive to Sioux Falls. That is what I did on vacation a few years ago. My vacation included a few days in both cities. It's about a three hour drive from Omaha to Sioux Falls. Both cities are very nice to visit. You can get a much better airfare into Omaha than Sioux Falls since it's a bigger airport with more flights departing and arriving. Southwest usually has some of the best airfares and sales. Go to http://www.southwest.com and check it out.
2 :
Try travelocity,kayak You can visit this site for Free coupon codes,Free Discount Coupons,Free Vouchers,Free Nights on Airlines and Hotels http://freetravel4ever.blogspot.com

What is the best plane fare from Los Angeles to San Jose Cabo (SJD) in Mexico? Travel date: August 9 7 days

What is the best plane fare from Los Angeles to San Jose Cabo (SJD) in Mexico? Travel date: August 9 7 days?
This is a historical question. I have information for 2008. I wanted to know how much you (or somebody you know) paid for this flight in the past, most specifically around July, August, September timeframe, Weekend to weekend. Are there any sales that may show up before August this year that will show better plane fares? I currently know of $293 round trip for August 9 thru 17. Thanks. Pls note that Kayak/orbitz currently have the $294 price. I've also been to the following and got higher prices: http://www.cheapair.com/ http://farecast.com/ http://www.farecompare.com/ http://www.airfarewatchdog.com/
Air Travel - 1 Answers
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1 :
http://www.cheapair.com/ http://farecast.com/ http://www.farecompare.com/ http://www.airfarewatchdog.com/ http://www.kayak.com/