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Here's an easy way to work this kind of problem......

Alex paints 1/6 of the wall in one hour and David paints 1/4 of the wall in one hour.

Let's just add these fractions...

1/6 + 1/4  = 10/24

Now...just take the reciprocal of this

24/10 = 2.4    .....and there's your answer (in hours)

50 x 80  =  4000

First, let's divide the 10.125 by the 4.5 resulting in 2.25  ...so we have...

19 = 4.5x + 2.25(7.5 +x)

Next, mutiply by 100 to clear the decimals.....so we have...

1900 = 450x + 225(7.5 + x)

Can you take it drom there ????

the answer to 50 x 8 is 400

Start whats in the parentheses so u would do 7.5+x

the answer is 4000 

4/5(x+3/4)+2(x+1/2)        distribute the 4/5 and the 2 over the terms in the parentheses

(4/5)x + 12/20 + 2x + 1 =

(4/5)x + 3/5 + 2x + 1  =

(4/5)x + 3/5 + (10/5)x + 5/5 =

(14/5)x + 8/5

4(x-2)= -3(2x+6)    distributing the 4 and the -3 over the terms in the parentheses, we have

4x - 8 = -6x - 18    add 6x and 8 to both sides

10x = -10              divide both sides 10

x = -1

Thanks geno......I'll fix that !!!   (It was just a mis-type .....)  ...the answers are correct.....

Let's see how Angelica got her answer. There are 43,560 sq ft in an acre. So, 1.2 x 43560 = 52272 sq ft.

6(x-3)=2x+38   distribute the 6 over the terms in the parentheses on the left

6x - 18 = 2x + 38   add 18 to both sides and subtract 2x from both sides

4x = 56        divide both sides by 4

x = 14

The total cost was 4 x $2.99 = $11.96......so the $2.00 coupon made Sandar's cost just $9.96

If you are supposed to use the quadratic equation, you will need values for a, b, and c.

First, move the  49  to the left side by subtracting.

9x² = 49  then becomes 9x² - 49  =  0 

Since the problems is missing the x-term, create an x-term, writing it as 0x and place it between the  x²  term and the number.

Now you have 9x² + 0x - 49  = 0

In the quadratic formula,  a = 9    b = 0    c = -49

It is simple, just inverse the second and multiply. So if you have 5/5 divided by 1/2, switch the numerator and denomenator of the second number and then multiply. So now you have 5/5 multiplied by 2/1. Once you have this, multiply strait across. 5*2 is 10, and 5*1 is 5. So your new number 10/5. Now reduce, so 10 divided by 5 is 2, and 5 divided by 5 is 1. So your answer is 2, because 2/1=2. 

TEH ANWSER IS NUTTIN

Usually, { } represents the empty set. The fact that it is empty means that there was no answer to put into it. Generally, it means that there was no answer.

TEH ANWSER IS NUTTIN 

If you go, the buffet will cost you $6.00.

If you want your total cost to be $11.00, the bus must only cost you $5.00.  ($11.00 - $6.00  =  $5.00)

How many persons must go so that your portion is only $5.00?

So:  How many persons times $5.00 each will have a total cost of $95.00?

$95.00 ÷ $5.00  =  the answer

First, you will need to factor:             10x² + 11x - 6

Because the last term (-6) is a negative, the parentheses will include one plus sign and one minus sign.

Find the factors of  10; they will be either  10  and  1    or    5  and  2.

Find the factors of 6; they will be either  6  and  1    or    3  and  2.

So, the possibilities are:

    (10x + 6)(1x - 1)              (10x - 6)(1x + 1)              (10x + 1)(1x - 6)              (10x - 1)(1x + 6)

    (5x + 6)(2x - 1)                (5x - 6)(2x + 1)                (5x + 3)(2x - 2)               (5x - 3)(2x + 2)

    (5x + 2)(2x - 3)                (5x - 2)(2x + 3)

Check each one!  The middle term must become +11x.

Once you have determined which one is correct, set each factor equal to zero to find the two answers.

5/5  =  1

1 ÷ 1/2   =   1 x 2/1   =   2

To divide by a common fraction, multiply by the reciprocal.

An appropriate equation is:

     rate x time (of the first person) +  rate x time (of the second person)  =   amount completed

Alex's rate is 1 wall painted in 6 hours, which is:  1 wall / 6 hrs

David's rate is 1 wall painted in 4 hours, which is:  1 wall / 4 hrs

Amount completed is 1 wall.

The time is the same for both, so let's use the variable  t.

    (1/6)·(t)  +  (1/4)·(t)   =   1

         t / 6   +   t / 4        =   1

Simplify the equation by multiplying both sides by a common denominator; I'll use 24:

     (24) · (1/6)·(t)  +  (24) · (1/4)·(t)    =  (24) · 1

            4t   +   6t   =  24

                      10t   =   24

                          t   =   2.4 hours

it will be 52272 square feet

the answer is 0.5