Melody

Hi Ginger - it is nice to see you here

    Tertre please do not double post like this !!!    

You can repost if you want but link the repost to the original question so that it is not double answered.

Like this

Isthere more to this question - like is this part c and you ahve already done the other bits or something?

of the 24 players who scored 2 goals or more at the 2010 FIFA World Cup, seven eights were not from brazil. How many of these players were not from brazil

7/8 of the 24 were not frm Brazil

of    means multiply so

that is

7/8 * 24 

and you can work that out on the web 2 calc if necessary ://

How do u find the y=mx+b if you only know that the slope is o.5 and the xintercept is (28,0)

\(b=0.5\\ y=mx+0.5\\ sub \;\;in\;\; x=28\;\;and\;\; y=0\\ 0=m*28+0.5\\ m*28=-0.5\\ m=\frac{-0.5}{28}\\ m=\frac{-1}{56}\\~\\ y=\frac{-x}{56}+0.5 \)

My school's math club has 6 boys and 8 girls. I need to select a team to send to the state math competition. We want 6 people on the team. In how many ways can I select the team to have more girls than boys?

0 boys,  6 girls           1*8C6   ways

1 boy     5 girls           6*8C5    ways

2 boys    4 girls           6C2 * 8C4   ways

add those altogether :)

Answered here 

Dear thisismyname,

I know that this is a repeat question.  That is fine but next time could you please put a link to the old question so that  there is no chance of it being answered twice :)

If I can easily find your first question - I will delete it :)

If lines   $y=(2a-5)x-5$  and $9y=(a+2)x-3$  are perpendicular, what are all the possible values of ? Express your answers in decreasing order, separated by commas.

If 2 lines are perpendicular the product of the gradients MUST equal -1

or to put it another way,

One gradient is the negative reciprocal of the other.    (except if one gradient is 0 and the other is infinity )

\(y=(2a-5)x-5 \quad (1)\\ y=\frac{a+2}{9}\;x-\frac{3}{9} \qquad (2)\\ (2a-5)* \frac{a+2}{9}=-1\\ (2a-5)* (a+2)=-9\\ 2a^2+4a-5a-10=-9\\ 2a^2-a-1=0\\ 2a^2-2a+a-1=0\\ 2a(a-1)+1(a-1)=0\\ (2a+1)(a-1)=0\\ a=-0.5\;\;a=1\\ solution\\ 1,\;-0.5\)

Thanks ElectricPavlov, your answer is spot on - yes i know that you know that :)

what is (6.4 times 10 to the negative 4 power) divided by (4 times 10 to the positive 6 power)

\((6.4*10^{-4})\div (4*10^6)\\ =\frac{6.4*10^{-4}}{ 4*10^6}\\ =\frac{1.6}{ 10^6*10^{+4}}\\ =\frac{1.6}{ 10^{10}}\\ =1.6*10^{-10}\)

Is the      8-x     suppose to be in brackets?