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Basically, just flip the second and multiply. 
1/8 + 7/4

1/8 + 4/7

Multiply.

                                  cosine 25^o = X / 13  

                                  X  =  13 • cos 25^o  

                                  X  =  13 •  0.9063  

                                  X  =  11.782  

No sorry, Thanks you guys! My teacher makes the instructions really confusing and I wasn't sure. Have a great day and thanks again ^^

Let x be the number of animals with 4 legs  

and y be the number of animals with 2 legs  

 So, 4 legs on x animals  

plus 2 legs on y animals                     expressed as   4x + 2y = 44  

total number of animals                      expressed as      x + y = 15   

y = 15 – x so sub into 1st equation     4(x) + 2(15 – x) =  44

                                                            4x + 30 – 2x     =  44

                                                                               2x  =  14

                                                                                 x  =  7       animals with 4 legs, i.e., horses 

sub 7 for x                                                           7 + y  =  15  

                                                                                  y  =  8       animals with 2 legs, i.e., chickens  

Check

7 horses have                28 legs  

8 chickens have             16 legs  

total legs                        44 legs

If you mean the negative of negative  of negative nine

- (-( -9))  = -9

tan 15 = opposite / adjacent

tan 15 = opp / 50      solve for   opp   the altitude of the plane as it (hopefully) misses the fence....

x + y = 15     the number of chickens and horses

4x+2y = 44

I would say A   but it appears incorrectly entered as an answer

    or maybe D   if it were   x+y = 15   

Angle   β = tan^-1(1/3) = 18.435º

Area = [10 * cos(β)]² = 90 squared units

1.5 dozen /  (1/3 hr ) =  4.5 dozen per 1 hour

I think -8 i think 

CPhill: A slight correction for the F(n).

F(n) =[Phi^n  -  (1 - Phi)^n] / sqrt(5)

6  +  15   =   ???

(  sqrt (2) / 2  +  sqrt (2) /2 i )^2   = 

(sqrt (2)  + sqrt (2) i)   / 4   =

(sqrt (2)  + sqrt (2) i)  ( sqrt (2) + sqrt (2) i)    /  4   =

(2 + 2i + 2i  +  2i^2)   / 4   =

( 2  + 4i  -  2)  / 4   =

4i / 4   =

i

Complete  the square on x , y

(x^2 + 8x + 16) + (y^2 + 6y + 9)  =  -c + 16  + 9

(x + 4)^2   +  ( y  + 3)^2   =  25  - c

We need  25  - c =  3^2

So

25 - c     = 9

25  -  9  =    c

16  =   c

Thanks!

% error

( true value -  measured value)  / true value  x   100%

We'll check your answer....if you want .....

"10"  appears 4 times  in the rows 0 - 14  inclusive

The number of  elements  in the first  n  rows  = (n + 1) (n + 2)  /  2 

So....the number of elements  =   (14 + 1) (14 + 2)   / 2   =   15 * 8    = 120

So

P(10)  =   4 / 120    =   1   /  30 

(6.00 - 5.43 ft) / 6.00 ft       * 100% = ..........  % error

t =  floor  (2 * t)  -  3

t will  have to be an integer  since  floor  (2*t)  will always produce an integer

t  =  3  is  the only value I find

72   = (12)  ( 2 + 0!) !

Question....we have to use all four digits in each expression......can we repeat any (or all) of these  ???

If so.....we have it made.....!!!!

Oh thanks for the hints! I think I can try to take it on from here! I'll reply back in here when I bump into problems. 

C ( a, b)   is  a combination

It counts sets  of things

Let's suppose that we have 10 different  objects  and I want to choose any two  of them....the number of different sets  =   C (10,2)    =  45  different sets

4x + 16 ≤   -20        subtract 16 from both sides

4x   ≤  -36             divide both sides  by 4

x ≤  -9