6.2km:1.7h

Divide both sides by 6.2

1km:0.274h

This gets you how long she would take to walk 1km. Times 0.274 by 10 to get how long 10km would take her.

10km:2.7h (1 d.c.p.)

It would take her 2.7 hours.

Go zac!!! Ur correct! 👍

i assume you mean :(23/5)-(2/7) 

(23/5)-(2/7) = 4.3142857142857143

3/4 + 7/12 - (-4) = 3/4 + 7/12 + 4 (two minuses make a plus)

3/4 + 7/12 + 4/1 = 9/12 + 7/12 + 48/12           (4 = 4/1 or 4 divided by 1)  

(to add the fractions the denominators need to be the same. Multiply both the denominator and numerator by the same number)

(9+7+48)/12 = 64/12 = 5 and 1/3 or 16/3

We can also get this answer by leaving the 4 as a whole number:

9/12 + 7/12 +4 = 16/12 + 4 = 1 and 1/3 + 4 = 5 and 1/3

If you put the sum in a calclator you also get 5 and 1/3.

Hope this helps :)

The first thing we should do is work out what the numbers inside the brackets equal.

4 x 5 + 20 - 10 = 20 + 20 - 10 = 30

Next we can cancel out the twos because any number multiplied by two and then divided by two equals that number.

2*30/2 = 30

Hope this helps :)

The square root of 45 can also be simplified using surds.

root 45 = root 9 times root 5

so 3 times root 5

If the problem is:  3^{x + 1}  =  6^{4 - x}

--->   ln( 3^{x + 1} )  =  ln( 6^{4 - x} )

--->   (x + 1)ln(3)  =  (4 - x)ln(6)

--->   x·ln(3) + ln(3)  =  4·ln(6) - x·ln(6)

--->    x·ln(3) + x·ln(6)  =  4·ln(6) - ln(3)

--->   x[ ln(3) + ln(6) ]  =  4·ln(6) - ln(3)

--->  x  =  [ 4·ln(6) - ln(3) ] / [ ln(3) + ln(6) ]

4X/2 = 4

Multiply both sides by 2, to get 4X on its own.

4X = 8

Divide both sides by 4 (the opposite opperation of 4X, which is 4 times X) to get X on its own.

X = 2

Another way to solve this is to simplify the fraction, by dividing 4X and 2 by 2, which equals 2X/1, or 2X.

Now 2X = 4, and by dividing both sides by 2, we see that X = 2

We can check our answer by substituting it into the equation:

4*2/2 = 4

By cancelling out the 2's we can see X=2 because 4=4

Hope this helps :) 

This is a very simple division problem. Simply divide 1.5x10^-10 by 2.5x10^-11 which is 6 meaning the Mercury atom is 6 times larger than a hydrogen atom. 

OMG PLEASE HELP ME I DONT GET IT!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

LMAOOO 21. its actually 19 but then again theres a way to prove that it is 21

b: for 8 hours lisa can run is 48 miles. because d=6h so 6*8=48

i believe its like that. 

The Answer is 30

6.7082039325

Pi/2

Because cos is given by the x  value on the unit circle.

square root of 2= 1 =8^x

'  It's best if you restrict yourself to one equals sign per equation, otherwise it's difficult to figure out what you could actually mean.

Lol. Yeah, can't think straight either when I'm tired!! 

Well, based on the math made by the anceint greeks there are these things called numbers. Numbers can be added or taken away or divided up. So if numbers do their thing and Greeks do their thing then why cant the d**n problem be what it wants to. D**n judgemental humans these days always judgeing numbers base on their outcome and not who they really are. You aint jesus, I am. Also, for example, If Joe has 500 apples and Sally says to add half of his to her total of zero, then how many does Joe have left? 500. Joe doesnt give nobody anything. Joe is his own man. He worked hard for those 500 apples and he isnt willing to just dish them out to whoever want one. What happens if Joe multiplies his 500 apples by zero? How many apples he has left? 499 cuz he ate one while laughing at Sally. Even Joe gets hungry. Give the guy a break.

Ah...I see the flaw in my reasoning......try this.....

The probability that  they don't all show the same number is 1 minus the probability that they DO all show the same number.

But there are only 6 ways that they all show the same number.

So

1 - 6/1296 = 1290 / 1296 = 25/26 = about 99.5%

19. 21 is part of a joke started by a vine video.

I assume this is.....

12x^2y= (1/28 )*3x*h       multiply both sides by 28 and divide by 3x

[(28)(12)x^2 y ] / [3x ]   = h     simplify

[(28)(12)/(3)] * [ x^2 / x] * y = h

[112 x] / y =  h 

Seriously? Again? What's so fun about this anyway?

Sorry, this one is wrong. I get your reasoning but I dont know how to do it.