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I don't think so.  It would be if you added 2 (+2)

This picture might help.....

-2[9 - (x + 7)]     work inside the brackets, first

-2 [ 9 - x - 7 ]     simplify

-2 [ 2 - x ]          distribute the -2  across both terms inside the brackets

-4 + 2x   or...  just   2x - 4

thank you ! 

Bonnie withdrew $1,200 from her savings account. She spent 1/5 of the money on travel arrangements. She spent 2/3 of the remaining amount at the hardware store. Finally, she treated her friend to lunch with some of the remaining money. After lunch, Bonnie had $300.50 left. How much money did Bonnie spend on lunch? 

Let's take this step by step

If she spent 1/5 of the $1200 on travel arrangements, then she must have had 4/5ths of this left.....so 1200 x 4/5  = $960

Then....she spent 2/3rds of this at the hardware store... so, she must have had 1/3  of $960 left = $320

Now....call the amount she spent for lunch = L

So....$320 - L = $300.50    rearrange this and we have

$320 - $300.50  = L   = $19.50  ... and that's what she spent on lunch

its just 21  lol

We know the adjacent side (30) and the hypoteneuse (50).....and the trig function that relates these two is the cosine....so we have

cosΘ = 30 / 50 

So, using the inverse sine to find Θ, we have

cos^-1 (30/50) = Θ = about 53.13°

1199.5 is the answer.

3.5  = log x

This says that

10^3.5  = x = about 3162.3

lg^2(2x)-9lg(x)+2=0

I assume that this is...

ln (2x)^2 - 9 ln x + 2 = 0  .... so we have

2ln(2x) - 9 ln (x) + 2 = 0

2ln(2) + 2ln(x) - 9ln(x) + 2 = 0     factor

-7(ln x) = -2 - 2 ln(2)  =

7 ln(x) = 2 + 2ln(2)

ln (x)  = [2 + 2ln(2)] / 7

In exponential form, we have

e ^ ((2 + 2ln(2))/7) = x = about 1.622

I assume that you're talking about multipying a number by itself.

It depends on the number...if the absolute value of a real number > 1, then the number becomes greater......but if the absolute value is greater than 0 but less than 1, the number is smaller.

Thus (-3) * (-3)  = 9

But  (2/3)(2/3) = 4/9   which is < 2/3

We can't "turn" 50/45 into a whole number, because it isn't a whole number...!!!!

It's either  50/45= 10/9 = 1 + 1/9    ...or... in decimal form.....1.1111 (repeating)

10 + 9

19

or if your not talking math

10 + 9

21

Anonymous has the correct answer, but be careful.....in the second step, he evaluates -1^2   ...and in the third step, that becomes 1 .......this is not correct..... -1^2 = -1

Actually, the second step should be

(-1)^2 + 7(-1) + 10  =  1 - 7 + 10   = 18

I know that this seems nit-picky, but we have a lot of younger members who have trouble with this kind of thing.....!!!

f(x)  =  X^2 -7X + 10

f(-1) = -1^2 -7(-1) + 10

f(-1) =  1 -7(-1) + 10

f(-1) = 1 + 7 + 10

f(-1) = 18

We can imagine this as the number of ordered sets represented as either (representative, alternate) or (alternate, representative).....so if we have students A and B, (A, B) and (B, A) are different sets.

So the total possibilites are given by the permutation P(8,2)  = 56....

for every one student there are 7 posibillities and there are 8 students

7*8=56

56 different outcome

http://lmgtfy.com/?q=gfc+of+21+and+35

the gcf of 21 and 35 is 7

Thanks, heureka.....

Notice how fast this coverges by using Newton's Method......the 4th and 5th terms agree to seven decimal places ....!!!!