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You can multiply it out like this:

(x + 4)*(2x + 5)

Multiply each thing in the first set of parenthesees by each thing in the second set of parenthesees and add the products together.

2x² + 5x + 8x  + 20

Combine like terms:

2x² +13x + 20

I agree.

45+62+72+59+62+100 = 400

-4                

1.0E15x\cdot \:999999999999

I think this is what the picture probably looks like:

Since the boxes are similar, I knew that the height of the red box was h/3.

volume = length * width * height

5292 cubic mm = 21 * 21 * h

Solve for h:

h = 5292 / 441 = 12 mm

red box volume = 7 * 7 * (12/3)

red box volume = 196 cubic mm

Also,

since you are reducing 3 dimensions by 3,

the new volume = old volume / 3³

the new volume= 5292 / 27 = 196 cubic mm

to the left of the 1 key.

The beach ball is a sphere......and the volume of a sphere is

(4/3) * pi * (diameter / 2)^3   =

(4/3) * pi * ( 18 / 2)^3  =

(4/3) * pi * ( 9 ) ^3  =

(4 / 3) * pi * (729) =

(729 / 3) * 4 * pi   =

243 * 4 * pi   ≈  3053.63 cubic centimeters

To find what number is in the middle, take the average:

\(\frac{76.7+77.2}{2}=\frac{153.9}{2}=76.95\)

Let the number of buckets of weeds = N.....then....the number of pots of petunias =  2N

So

N ( amount paid for each bucket of weeds) + 2N (amount paid for each petunia pot )  = $30

N ( .75)  + 2N (1.50)  = $30     simplify

.75N + 3N  = 30

3.75N  = 30       divide both sides by 3.75

N = 8   =  buckets of weeds     

2N  = 16  = pots of petunias

(-9)² - (4)(8)(-8)

(-9)(-9) - (4)(8)(-8)

81 - (32)(-8)

81 - (-256)

81 + 256 = 337

Use the change-of-base rule, here

log_a b  =   log b / log a

So

log ₂ 17   =     log 17  / log 2   ≈ 4.087

5 / 9   =   x / 20        cross-multiply

20 * 5  = 9 * x        divide both sides by 9

[ 20 * 5 ] / 9   = x

100 / 9    = x   =   11 + 1/9     seconds

2 √56  - 5 √20  =

2 √[ 4 * 14 ]  - 5  √ [4 * 5 ]  =

2 * √4 * √ 14   -  5 * √4  *  √ 5   =

2 * 2 *  √ 14   -   5 * 2 *  √ 5  =

4 √14  -  10 √5

I like a lot of food, but my favorite would have to be taccos 

Ok thanks, its illuminating...

Okay, I'm really bad at probabilities but I will try it...

I will use the question I said just because it's easier.

Also, I think I should have said that each time you take one person out of the room, a new person comes into the room.

If you don't replace the person you took out, then it changes the answer.

SO

Probability of first person to have on a blue shirt: 85/100

Probability of second person to have on a blue shirt: 85/100

Probability of third person to have on a blue shirt: 85/100

...and so on...

Multiply all the probabilities together:

\(\frac{85}{100}*\frac{85}{100}*\frac{85}{100}*\frac{85}{100}*\frac{85}{100}*\frac{85}{100}*\frac{85}{100}*\frac{85}{100}*\frac{85}{100} \\~\\ =(\frac{85}{100})^9 \\~\\ \approx 0.2316\)

So about a 23.16 % chance.

I know this is probably the worst way of doing it but I tried...

(7) + (-6) + (1)

or 

7 - (6 - 1)

or

7 + 1 - 6

You neglected the negative sign by making it 7-7.  You're not adding 1 to 6, you're supposed to add 1 to -6.

For addition/subraction, there is no order since you're doing the exact same thing.  1 + 1 can be said as 1 - (-1).  Both will be 2.  Same goes with multiplication and division.  Doesn't matter which of the two goes first, as long as multiplication/division goes before addition/subtraction.

With the website re-design, there are some transient issues.....you might try using another online calculator......

I like WolframAlpha....it will calculate most anything :

https://www.wolframalpha.com/input/?i=4sinxcos%5E2x+-+sinx

Okay so if the problem has multiplication you do that first. 

Your problem is 7-3*2+1=2

so 3*2=6 and then you will have 7-6+1=2, then you subtract 7 from 6 and get 1, and finally add 1 + 1 and you get the answer 2.

Yes, it is doing the same for me.

I will let sdmin know :)

Yes exactly I mean that, "order of operations". (+) is must before (-) right? 1 (*), 2 (+), 3 (-). First 3*2, next 6+1, then 7-7.