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Tutors Answer Your Questions about real-numbers (FREE)
Question 26113: I do not fully sure get why (-4)squared is 16, but -4 squared without perenthisis is -16. In other words, (-A)squared =A squared, but -A squared = -A squared. Please clear this up! Also, I do not see how to show exponents on the computer. Thanks, Drew Lurie
Click here to see answer by mathrebel(25)   |
Question 26489: this question is about order of operations. i have a book called Painless Algerbra, and it has different exercises for me to do. well there was a exercise on how to compute the value of the expression and i got a different answer than the one the book has. so i wanted to know if i was really wrong. the expression was: 16 - 2 times 4 + 3
this is what i did: 16 - 2 times 4 + 3
16 - 8 + 3
16 - 11
5
my answer was 5 but the books answer was 11
am i worng? and if i am why?
Click here to see answer by queenofit(120) |
Question 25972: this is just a test to see if you actually send an email back, because i have to research a website for my honors algebra 2 class, and i chose this site. If i give a good review, my whole class may start using this site, because i find it most helpful! my question is, what is the difference between rational and irrational numbers? Thanks
-Sean Mason
Click here to see answer by venugopalramana(3286)  |
Question 30608: I have been out school for 12yrs, and I decided to take college algebra and I am having problems. My problem is I can't remember how to multiply more then two numbers. -1/2 x (8) x (-2/3) x (-6)= , or like -1/8 x (-1/4) x (-3/5)= . I'm confused! thanks if you can help.......
Click here to see answer by askmemath(368) |
Question 30964: Please help me out with this I have NO idea how to begin solving this problem.
The sum of two numbers is 100. One number is at least 100. One number is at least 16 more than the other number. What are the two numbers?
Click here to see answer by Paul(988) |
Question 30966: A couple does not want to have a charge of more than $50 for dinner at a restaurant. A sales tax of 4% is added to the bill, and they plan to tip 15% after the tax has been added. What can the couple spend of the meal?
Click here to see answer by mbarugel(146) |
Question 30124: My 22 year old husband is in the Army and he just entered into the EArmyU program and he is away at sergeant school for 2 weeks. I have to help him out on his homework while he gone and this is the only question I cannot find. It's been 4 years since I have done any type of math. Please help me answer this question:
How many rational numbers are there between 0 and 1? Why?
Click here to see answer by stanbon(26259) |
Question 33667: A traveling salesman (selling shoes) stops at a farm in the Midwest. Before he could knock on the door, he noticed an old truck on fire. He rushed over and pulled a young lady out of the flaming truck. Farmer Brown came out and gratefully thanked the traveling salesman for saving his daughter’s life. Mr. Brown insisted on giving the man an award for his heroism.
So, the salesman said, “If you insist, I do not want much. Get your checkerboard and place one penny on the first square. Then place two pennies on the next square. Then place four pennies on the third square. Continue this until all 64 squares are covered with pennies.” As he’d been saving pennies for over 25 years, Mr. Brown did not consider this much of an award, but soon realized he made a miscalculation on the amount of money involved.
a)How much money would Mr. Brown have to put on the 32nd square?
b)How much would the traveling salesman receive if the checkerboard only had 32 squares?
c)Calculate the amount of money necessary to fill the whole checkerboard (64 squares). How much money would the farmer need to give the salesman?
Click here to see answer by Earlsdon(4898) |
Question 33666: Use the geometric sequence of numbers 1, 1/2, 1/4, 1/8,…to find the following:
a)What is r, the ratio between 2 consecutive terms?
b)Using the formula for the sum of the first n terms of a geometric series, what is the sum of the first 10 terms? Round your answer to 4 decimals.
Click here to see answer by stanbon(26259) |
Question 33873: Use the geometric sequence of numbers 1, 2, 4, 8,…to find the following:
a)What is r, the ratio between 2 consecutive terms?
b)Using the formula for the nth term of a geometric sequence, what is the 24th term?
c)Using the formula for the sum of a geometric series, what is the sum of the first 10 terms?
Click here to see answer by sarah_adam(201) |
Question 33874: Use the arithmetic sequence of numbers 1, 3, 5, 7, 9,…to find the following:
a)What is d, the difference between any 2 terms?
b)Using the formula for the nth term of an arithmetic sequence, what is 101st term?
c)Using the formula for the sum of an arithmetic series, what is the sum of the first 20 terms?
Click here to see answer by sarah_adam(201) |
Question 34388: this is my question, I just didn't know what catergory to put it in this is my last problem I have to finish this assignment if someone could get back to me asap I would greatly appreciate it.
Find 8b(1.7f)
thank you
Click here to see answer by lyra(94)  |
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Older solutions: 1..45, 46..90, 91..135, 136..180, 181..225, 226..270, 271..315, 316..360, 361..405, 406..450, 451..495, 496..540, 541..585, 586..630, 631..675, 676..720, 721..765, 766..810, 811..855, 856..900, 901..945, 946..990, 991..1035, 1036..1080, 1081..1125, 1126..1170, 1171..1215, 1216..1260, 1261..1305
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