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no it's because there is something on the culculator you need or want

x^2 + 2(3x) + 3^2

simplified is

----->>  x^2 + 6x + 9 <<-------

(65/11)x + 15 - (10/11)x - 19   =

(65/11)x - (10/11)x + 15  - 19   =

(55/11)x  - 4  =

5x   -  4

well to find Cosx=(#) then you can just take the arccos(#) or cos^-1 (#) and just plug it ino the calculator.

in this case the arccos(1/4)= 1.31811 in radians or 75.52 degrees 

But i will still try to answer some problemos 

The chance that any die shows a prime number = 4/10......so we have

C(4,2) * (.4)^2 * (.6)^2   =   28/45  = about 62.22%

If is says P([something],[something]) then it has to do with permutation. I dont know what that would really do, black. So go search up permutations calculator on like the web or something 

You dive the top number by the bottom them multiply by a hundred .
 

30 = -6(k+4)

you first solve the parentheses

30 = -6k -24

add 24 to both sides

54=-6k

divide each side by -6

-9 = k

30= -6(k+4)    divide both sides by -6

-5 = k + 4     subtract 4 from both sides

-9  = k

The triangles in the prism are congruent, so you find the area of one triangular base and multiply it by two.

Then, you find the area of each of the rectangles. This is a mandatory step unless the question specifies that the triangle bases are isosceles or equilateral. In those cases, you can multiply the rectangular face by two or three and find the other rectangular face. (if isosceles)

Just add up the areas of all the faces and that is the surface area of a triangular prism.

x^2+8y=16
 3x+4y=12

Multiply the second equation by 2  .....this gives us     6x + 8y  = 24

Rearrange this to   ....    8y = 24 - 6x      and substitute this into the first equation....so we have

x^2 + [24 - 6x] = 16     simplify

x^2 - 6x + 8  = 0       factor

(x - 4) (x -2) = 0     and setting both factors to 0, we have that x = 2 and x = 4

And using the second equation to find y in both cases

3(2) + 4y = 12              3(4) + 4y  = 12

6 + 4y = 12                   12 + 4y   = 12

4y = 6                             4y  =  0

y = 3/2                             y = 0

So....the intersection points are (2, 3/2)  and ( 4, 0 )

Here's a graph  :  https://www.desmos.com/calculator/ac9ayppsom

62%

The sum of these probabilities gives us the answer

P(5 heads)  = C(7,5) * (.5)^5 * (.5)^2  +

P(6 heads) = C(7,6) * (.5)^6 * (.5)^1 +

P(7 heads)  = (.5)^7

=  29 / 128     =  about 22.66%

The answer given to this is 
10(cos 40°+i sin 40°)
Can you please explain , thank you 

you stupid

[2(cos 100°+sin 100°)] [5(cos300°+i sin 300°)]   =

10 [ -sin (pi / 18) + i cos(pi/18)]  [ 1/2 - (√3/2) i]   [exact form]

10 [ -0.1736 + .9848i] [ .5 - . 866i]  =

10 [ -0.0868 + .4924i + 0.15033i - 0.8528i^2]  =

10 [ -0.0868 + 0.8528 + .64273i]  =

10 [ .766 + .64273i] =

7.66 + 6.4273i        [approximation]

=19/29-(4 i)/29

the branch of mathematics dealing with the properties and manipulation of numbers.

the branch of mathematics dealing with the properties and manipulation of numbers.