All Answers 358089 Answers

sin(30°) = 1/2;   cos(150°) = -cos(30°) = -sqrt(3)/2;   tan(60°) = sqrt(3)

so we have  1/4 + 3/4 + 3 = 4

I´m not sure how to explain it but I´ll give you my solution:

(c+1)/(c^2-1)-(c+1)/(1-c)=

= 1/(c-1) - (c+1)/(1-c)                                                              (conjugates)

= (1-c)/(c-1)(1-c)  - (c+1)(c-1)/(c-1)(1-c)                                 (common denominators)

= (1-c)+(-(c-1)(c+1))/ -(c-1)(c-1)                                               the red text is replaced with 1 due to divison

= (1+ c+1)/(c-1)

=(c+2)/(c-1)     

VSB

Good luck, if i have been unclear about something, ask me or someone else here:)

-8 + 7x/2 = 6  Add 8 to both sides to get:

7x/2 = 14       Multiply both sides by 2 to get:

7x = 28          Divide both sides by 7 to get:

x = 4

.

It means "divide".  i.e. 1/3 means 1 divided by 3

Do (1/6) / (3/2)  *3/2 is equal to 1 1/2

1000e^(.05X)=1

X=?

rearrange the left side, so that we have:

1000.e^(X/20)=1.............

and in a number of steps you will get:

X = -60 (log(2)+log(5))=-138.1551055......etc.

WHICH IS THE ACCURATE RESULT, BECAUSE IT =1

GOOD LUCK

Thank you

6x^2-22x-8

Yes the firs one is right so just add them:)

Would the answer be (-14,5) as (1,2)-(15,-3) is equal to (-14,5)

First divide both sides with 1000

so now it is e^(.05X)=0,001

now use the ln (the natural logarithm) on both sides

ln e^(0,5X)=ln0,001

0,5X=ln0,001

X=(ln0,001)/0,5

X=2 (ln0,001)

good luck

headingnorth:

Would it then in this scenario be a+b=(6,1)

and in this case since its -3b I would multiply 5 and -1 with 3.

3b = (15, -3)

and a= (1,2)

or would I use the a+b=6,1) so a-3b = 6-(3*1)

you are getting readt for a 640 mile car trip you use 160 miles on 5 gallons of gasoline how many gallons of gas will you use, if gasoline costs $2.29 per gallon? how money will you use?

1- 160/5=32 miles to the gallon that the car does.

2-640/32=20 number of gallon that the car will use on a 640 mile trip.

3-20 x $2.29=$45.80 That would be the cost of the trip for gasoline.

just an english comment passing through

37.44 in scientific notation

It just means move the decimal point to the left times 10^1

So it becomes 3.744 X 10^1

It just means (2,000)^7=1.28 x 10^23

Just multiply the two numbers together: 4.99 X 6.5=$32.44, the cost of 6.5 pounds.

Look at this, 

Let c = (x1,y1) and d = (x2,y2)

c+d = (x1+x2,y1+y2) 

λ(x,y)= (λx,λy) where λ is any number

and as always the multiplication will be executed before addition. 

Good luck and please ask again if you didn't get it:))

YES!!. YOU GOT IT. CONGRATS!.

Pi is the ratio of the circumference of a circle to its diameter. It's always the same for any circle, small or large, and it's irrational number, which means that you cannot write it as a ratio of two numbers, such as 22/7. Its exact value is 3.14159265358.........and goes on FOREVER!.

3\4 + 1\2

\(\frac{3}{4} + \frac{1}{2} \\ =\frac{1+2}{4} + \frac{1}{2} \\ =\frac{1}{4}+\frac{2}{4} + \frac{1}{2} \\ =\frac{1}{4}+\frac{1}{2} + \frac{1}{2} \\ =\frac{1}{4}+1 \\ =1\frac{1}{4}\\ =\frac{5}{4}\)

Take the "Firefox browser". Now I have no more problems. It is as earlier.

Always happens to me to, i try using different devices to log in.

Nice!