CPhill

"Of" means "multiply"

15%  = 0.15

So...

15%  of 13  =

0.15 * 13  =

1.95

Not true, Melody........we actually CAN help you with your bed......

See the directions for a well-made bed, here :  http://www.wikihow.com/Make-Your-Bed

Just multiply 45.67 * 3.87

I happen to remember this from trig class....

Note that we can write

sin 40  = 2sin20cos 20    rearrange

cos20  = sin40/ [2 sin20]

And....likewise

sin80 = 2sin40cos40

cos40 = sin80 /[2sin40]

And

sin160 = 2sin80cos80

cos80 = sin160/[2sin80]

So

cos20*cos40*cos80  =

sin40/ [ 2sin20]  * sin80/ [2sin40]   *  sin160 / [2sin80] =

sin160 / [8 sin20] =

(1/8) sin160/sin20

Note that sin160  =   sin(180 - 20)   =  sin180cos20 - sin20cos180  =  sin20

So

(1/8)sin20 / sin20   =

(1/8)

(4/3) *pi * (5) ^3  =

(4/3) *pi * 125  =

(500/3) pi   = 

about 523.6 units^3

15% of 60  =

0.15 * 60  =

9

Actually...there are 7 roots.....3 real and 4 non-real

 x = ± √5   and x =  -3       are the real roots

And there are 4 non-real roots [ two conjugate pairs, as expected]

Surface area =

2 [ lw + lh + hw ]  =

2 [ 20*5 + 20*18 + 18*5]   =

2 [ 100 + 360 + 90]  =

2 [ 550]  =

1100 sq units

Thanks, Landry.......since we have a distance, x must be positive.........so......

(x - 6) (x + 4)  = 0

Set both factors = 0       and x = 6 or x = -4

And x = 6 is correct

The y intercept value occurs when x = 0....so

-2(0+2)(0-1)(0-5)  =

-2 (2)(-1)(-5)   =

- 4 * 5  =

-20