Homework Help

1) 3 5/7 divided by 7/82)12 5/6 + 8 9/163)6(-3)     (-3 is an...

user profile pic

maganda123 | eNoter

Posted October 16, 2008 at 5:45 PM via web

dislike 0 like

1) 3 5/7 divided by 7/8

2)12 5/6 + 8 9/16

3)6(-3)     (-3 is an exponent)

4)14569000

There are 4 questions.

number 1 and 2, is solving fractions.(division and addition)

number 3 is writing it into standard form

number 4 is expressing the number into scientific notation.

please help me               thank you

3 Answers | Add Yours

user profile pic

ladyvols1 | High School Teacher | (Level 3) Senior Educator

Posted October 17, 2008 at 12:58 AM (Answer #1)

dislike 0 like

In dividing fractions you first have to make all numbers improper by multiplying the denominator by the whole number and add it to the numerator.  You invert the second fraction and multiply then reduce.  The answer to 1 is 4 and 12/49

In adding fractions you must find the common denominator then add the numerators, place that over the denominator and reduce.  The answer to # 2 ) is 21 and 19/48

In three you must multiply 1/6 by 1/6 by 1/6 and the answer is 1/216.  When you have a negative exponent you must use the reciprocal of 6 which is 1/6.

Last 1.4569 X 10 (7) with 7 being exponent.  You move the decimal all the way over to the first number and then count you place values to find the exponent.

user profile pic

vitullokj | Middle School Teacher | eNotes Newbie

Posted October 20, 2008 at 3:55 AM (Answer #2)

dislike 0 like

1.  3 5/7 divided by 7/8...

  Change 3 5/7 to an improper fraction... 26/7 then multiply it by the recripical of 7/8 which is 8/7.  Now we have 26/7 x 8/7 = 208/49 = 4 12/49

2.  12 5/6 + 8 9/16

  Find a common denominator...  48   Find the equivalent fractions  12 5/6 = 12 40/48       8 9/16 = 8 27/48   Add them

20 67/48 = 21 19/48

3.  6(-3) = -18  () is the same as multiplying.  A positive times a negative is a negative.

 

4.  14569000 = 1.4569 X 10 to the 7th power.

user profile pic

revolution | College Teacher | Valedictorian

Posted July 4, 2010 at 3:14 PM (Answer #3)

dislike 0 like

1) 3 5/7 divided by 7/8.

First, change 3 5/7 into an improper fraction of 26/7 and then divided by 7/8. Remember to flip 7/8 over to become 8/7 and also to change the division sign to the multiplication sign when you do so. LIke this:

3 5/7 / 7/8 = 26/7 * 8/7

= 4 12/49

2) 12 5/6 + 8 9/16

convert both fractions into improper fractions:

77/6 + 137/16

Then, find the common denominator which is 48

616/48 + 411/48

= 1027/48

= 21 19/48

3) 6^ -3

convert negative index to positive index, which is:

1/6^3= 1/216

4) 14569000

Move the decimal to the first number. The number before the decimal place must be less than 10 and more than zero, like from 1-9, and later count the place values to get the index notation, which is at its 7th power. So, the index notation should be:

1.4569 * 10^7

Join to answer this question

Join a community of thousands of dedicated teachers and students.

Join eNotes