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 Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion

January 9th, 2018, 10:22 AM   #1
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Joined: Jan 2017
From: London

Posts: 4
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Handling Numbers

Hi All,

I'm stating out again to learn some mathematics because of mainly my interest in science and my job in finance.

I'm working through a book on Foundation Mathematics and I'm struggling with the exercises attached. Particularly the following items:

Q1b...I make it out to be 1/4sqt81?

Q2..Total guess but I make it out to be 1 meter

Q4...No clue whatsoever apart from knowing 880 in base 10 has 8*10^2, 8*10, 0

Q6a... I make out to be 1/(8/15)

Q6b sqt7/12

Q7...Didn't understand this question

Q8...I make out X can be 3, 4, 5, 6, -3, -4, -5, -6

Q10...I make 4% gain

Q11...I make out 9/25...How would you approach this?

Q13...No clue

Thanks
Attached Images
 Chapter 1 Miscellaneous exercises a.jpg (88.8 KB, 17 views) Chapter 1 Miscellaneous exercises b.jpg (90.6 KB, 11 views)

 January 9th, 2018, 04:50 PM #2 Math Team   Joined: Jan 2015 From: Alabama Posts: 3,264 Thanks: 902 Sigh. What you wrote was 1/4 times the square root of 81 which is 9/4 and not the correct answer to the problem. I suspect that you meant "fourth root of 81" which is correct but would be better written as "3". Thanks from mathsonlooker
 January 9th, 2018, 05:15 PM #3 Global Moderator   Joined: Dec 2006 Posts: 20,751 Thanks: 2135 Sigh. 1(b) 2^(-2) = 1/4, and 81^(-1/4) = 1/3. 2 10 minutes is 60 times 10 seconds, so the answer is 6$x$. 4 In our decimal system, the Betzelgar base is 7. 6(a) 1/(8/15) = 15/8 (or 1 7/8) 6(b) (√3)/6 or 1/(2√3) 7 What part(s) didn't you understand? 8 The collection consists of the intervals [-4,-1] and [3,6]. Note that the values needn't be integers. 10 4% is correct. 11 36/99 = 4/11 13 The base is 6. Thanks from mathsonlooker
 January 11th, 2018, 09:43 AM #4 Newbie   Joined: Jan 2017 From: London Posts: 4 Thanks: 0 Thanks for you contribution guys @ Country Boy and skipjack. For some of the answers provided I have seen the errors or my ways and for others I'll pour over them once more

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