+0  
 
-1
463
5
avatar+4150 

2(r+2) + 5(1+5r)=63

Also this one that i'm stuck on

-30+7b=4(1+6b)

zegroes  Aug 18, 2015

Best Answer 

 #5
avatar+92919 
+10

Hi Zegroes  

 

2(r+2) + 5(1+5r)=63

2r+4    + 5+25r   =63

2r+25r   +4+ 5   =63

27r       +9          =63

                   27r  = 54

                    r    =  54/27

                    r    =  2

 

Also this one that i'm stuck on

-30+7b       =   4(1+6b)

-30+7b      =   4   +  24b

-30+7b-4   =   4   +  24b-4

-34 +7b      =   24b

-34 +7b -7b =   24b-7b

-34             =  17b

-34/17        =  17b/17

-2               =  b

             b =  -2

Melody  Aug 18, 2015
 #1
avatar+3088 
+10

Problem #1:

$${\mathtt{2}}{\mathtt{\,\times\,}}\left({\mathtt{r}}{\mathtt{\,\small\textbf+\,}}{\mathtt{2}}\right){\mathtt{\,\small\textbf+\,}}{\mathtt{5}}{\mathtt{\,\times\,}}\left({\mathtt{1}}{\mathtt{\,\small\textbf+\,}}{\mathtt{5}}{\mathtt{\,\times\,}}{\mathtt{r}}\right) = {\mathtt{63}}$$

2*r=2r

2*2=4

5*1=5

5*5r=25r

2r+4+5+25r=63

2r+25r=27r

4+5=9

$${\mathtt{27}}{\mathtt{\,\times\,}}{\mathtt{r}}{\mathtt{\,\small\textbf+\,}}{\mathtt{9}} = {\mathtt{63}}$$

$${\mathtt{63}}{\mathtt{\,-\,}}{\mathtt{9}} = {\mathtt{54}}$$

$${\mathtt{27}}{\mathtt{\,\times\,}}{\mathtt{r}} = {\mathtt{54}}$$

54/27 and 27/27= 2

$${\mathtt{R}} = {\mathtt{2}}$$

TitaniumRome  Aug 18, 2015
 #2
avatar
+10

Reduce[2 (2 + r) + 5 (1 + 5 r) = 63, r]

4+2r+5+25r=63

9+27r=63

27r=63-9=54

r=54/27=2

Guest Aug 18, 2015
 #3
avatar+3088 
+10

Problem #2:

im guessing this is simplification 

-30+7b=4(1+6b)

4*1=4

4*6b=24b

-30+7b=4+24b

TitaniumRome  Aug 18, 2015
 #4
avatar
+10

Reduce[-30 + 7 b = 4 (1 + 6 b), b]

-30+7b=4+24b

-30-4=24b-7b

-34=17

b=-34/17=-2

Guest Aug 18, 2015
 #5
avatar+92919 
+10
Best Answer

Hi Zegroes  

 

2(r+2) + 5(1+5r)=63

2r+4    + 5+25r   =63

2r+25r   +4+ 5   =63

27r       +9          =63

                   27r  = 54

                    r    =  54/27

                    r    =  2

 

Also this one that i'm stuck on

-30+7b       =   4(1+6b)

-30+7b      =   4   +  24b

-30+7b-4   =   4   +  24b-4

-34 +7b      =   24b

-34 +7b -7b =   24b-7b

-34             =  17b

-34/17        =  17b/17

-2               =  b

             b =  -2

Melody  Aug 18, 2015

11 Online Users

New Privacy Policy

We use cookies to personalise content and advertisements and to analyse access to our website. Furthermore, our partners for online advertising receive information about your use of our website.
For more information: our cookie policy and privacy policy.