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"The formula for the sum of an infinite series is a/(1-r), where a is the first term in the series and r is the common ratio i.e. the number that each term is multiplied by to get the next term in the sequence. To find r, divide any term in the series by the prior term."  

I didn't know that, I just copied it off the internet.  Let's see if I can use it right.    

Considering  10 + 10r + 10r^2 + 10r^3 + 10r^4 + ... = 8    

                      The first term is 10 and it looks like r is r. 

So       

                                        10      

                                      –––––  =  8   

                                       1 –  r    

                                            10  =  8 – 8r   

                                             8r  =  8 – 10   

                                               r  =  –0.25   

Can it really be that easy?  Would somebody who knows how      

to solve this kind of problem please check these figures?                      

_.

B=Blue marbles,   R=Red marbles

R =2/5 B
B   -  44 

R =1.5 * [B - 44]
2/5 B =1.5 * [B - 44], solve for B

B= 60 - Blue marbles
2/5 * 60 = 24 - Red marbles in the box.

Thank you so muchh!! 

We have \(p(x)q(x)=(ax^2-5x+6)(bx^2+3x-2)\), so \(20=3a-5b\) and \(30=-2a+6b-15\). Solving the system of equations gives \(a=43.125\) and \(b=21.875\), so \(a+b=65\).

No solution I might be wrong  can someone confirm?

Sorry Im so late but tysm your my hero 

See if this helps :

https://www.mathhomeworkanswers.org/265744/help-help

Let F be the number of friends and S be the total number of  stamps.....we have these equations :

S - 2F  = 6   

S - 3F  = -1       ("short 1" means  negative 1 )

Multiply the first equation by 3  and the second equation by -2

3S - 6F  = 18

-2S +6F =  2       add these

S  =  20

So.....he has 20 stamps  and he has   20 - 2F = 6   →  2F = 20 - 6 →  2F = 14  →  7 friends

Let P be the  true price of  one pair of these shoes and let M be the amount of money he has 

So   we have these  equations :

11P =    M + 145      →   M = 11P - 145      (1)

8P =      M - 182      →    M = 8P + 182      (2)

Equate (1) and (2)

11P - 145  = 8P + 182     rearrange as

11P - 8P =  182 + 145

3P = 327

P = 327/3 =  $109  = the price of one pair

So 11 pair cost   11*109  =  $1199

2%  = .02

Let the fat content in whole milk be x

And 50% of this =  .50x

So

x  - .50x  = .02

.50x = .02

x = .02/.50 = .04 =   4%   = 4/100 = 1/25   (fat content in  whole milk )

Half circle : r = 3 thus 1/2 x pi r ^ 2 = 14.135

4 x 5 = 20 

2 x 6 = 12 

4 x 7 = 28 

Thus the answer would be : 14.135 + 20 + 12 + 28 = 74.135

Break these questions into multiple basic shapes and then solve 

The final answer is \(101\) btw.

Area is \((4)(9)+2^2+(4)(5)+\frac12(3^2)\pi = 74.13\).