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because it helps ur brain

1/2x + 13 = 9

You want to get the variable (x) by itself, so to do that, add or subtract the number with the variable. If it's positive, you subtract, if it is negative, you add. 

1/2x + 13 = 9

        -13       -13

1/2x = -4

and now you should have that. now, all you need to do, is multiply or divide. If the variable is being multiplied by the number next to it (1/2x) then you divide it on both sides. If it is being divided by the number next to it (1/2 / x) then you multiply it on both sides. In this case, you are dividing it on both sides. 

1/2x = -4

/ 1/2     / 1/2

-4 divided by 1/2 equals -2. So X = -2. I  hope this helped.

idk bro

(108km)/(2h)=56000m/s

well, we can replace k with x, so we get x-8/5=12. the formula is saying that if i take away 8/5 from a number and get twelve, what number did i start of with?. if you are taking away 8/5 from a number, it means that the number you are trying to work out is 8/5 bigger than the number you got. in other words, x-8/5=12 is the same as 12+8/5=x. you can even get rid of x to get 12+8/5. so, what is 12+8/5? I will leave that to you to figure it out. 

An Internet search suggests that in 1936 the black Rapids glacier moved an average of 115 ft a day for a total of 4 miles.

1 ft is 0.0254*12 metres

1 day is 3600*24 seconds

So 115 ft per day is a speed of 115*0.0254*12/(3600*24) m/s

I'll leave you to crunch the numbers.

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(2/7)2 = (2*2)/7 = 4/7 = 0.5714285757142857

300:(23-3) → 300:20 → 30:2 ⇒ 15:1

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You need to supply the distance the metal stakes moved and the time they took.

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This factors as (a - 3)^2 = 0 so there is a double root at a = 3

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This factors as (x + 1)^2 = 0 so there is a double root at x = -1

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Mine was a 4 day weekend

😎

Learn to use the calculator here. If you have any problems, then ask for help.

what is the square number of 45?

1) When you say "what is the square of 45", it means what is: 45 x 45 =2,025.

2)When you say "what is the square ROOT of 45", it means: sqrt(45) =6.70820........etc.

3) ALWAYS try to undertand what you are actually asking.

Learn to use the calculator here.If you have problem, then ask for help.

how much of a 50 gram sample of gold is left over after 10.8 days if its half-time is 2.70 days?

A = 50 2^-(10.8/2.7)

A=50 . 0.0625

A=3.125 grams left after 10.8 days.

P.S. It is called "half-life" NOT "half-time".
 

23 ^ 2-13 ^ 2

------------------

4 * 3 ^ 2

\(\frac{23^{2} -13^{2} }{4\times 3^{2} } =\frac{360}{36}=10 \)

79 because science

Hello Guest!

How do you devide a negitive by a positive fraction?

A fraction is divided by a fraction,

by the dividend multiplied by the inverse of the divisor.

\(\frac{3}{4} :\frac{1}{2} =\frac{3}{4} \times \frac{2}{1}=\frac{6}{4}= 1\frac{1}{2} \)

\(\frac{4}{7} :-\frac{2}{3} =\frac{4}{7} \times -\frac{3}{2}=-\frac{12}{14}= -\frac{6}{7} \) 

\(-\frac{4}{7} :\frac{2}{3} =-\frac{4}{7} \times \frac{3}{2}=-\frac{12}{14}= -\frac{6}{7} \)

Greeting asinus :- )  !