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Sorry ... but 1. is D

It is positive, since the slope is positive

The only choices are 0.8 or 1

Since 1 is a straight line it has to be 0.8

The y-intercept would be 6 in this case, yes? 

The wavelength would be 2π again and regarding the amplitude, that would be 1?

Lastly, the midline would be 6?

Note: Apologies for late responses, time zones are awful!
 

?

Can you make the last bit more clear?

1. 20

Andrew = a

M = m  =  a+4

5 * a = 3 (a+4)     solve for 'a'       then        m= mike's age = a+4

Not sure.....but if you draw a line through the sctterpoints of data , the line slope is   0.8

  rise/run    =    8/10 = .8

Welll......which equation, when you solve for 'x'    equals 10

example

x = 1/2 (4+7)    = 1/2 (11) = 5.5     this one does not

      and the last one does not even have 'x' in the equation...

          so it is one of the other two.....   try each and see which one results in x = 10

Paul's                    =         Maggie's

$ 4  +  3.50 x          =       $ 3   +    3.75 x       

1 + 3.50 x   = 3.75 x                                     solve for 'x' the number of games to be equal charges

According to Segments of Secants Theorem

28 * 20   = 32 * x       Solve for x

three pointers   were    5 out of    (5+7) = 12    or   5/12 were baskets

5/12  of  x tries   resulted in 45 points       45 points means there was 15     '3-pointers'

5/12 x = 15      solve for 'x'

Exact will have to contain pi in the answer

circumference  =   pi  * d         d = 2r = 2 (50) = 100

  EXACT circumference would be      100 pi   

@geno omg im so dumb, i forgot the question said "girls", not "boys". Thanks geno!

(1-log(24, 6))*(1-log(24, 4)) = 1.0000000000000005         

                                         by just plugging into the Web2.0 calculator....      ~~ 1

The water cooler:  V  =  pi · radius² · height  =  pi · (9)² · (22)  =  1782 pi.

The paper cup:     V  =  (1/3) · pi · radius² · height  =  (1/3) · pi · (2)² · (3)  =  4 pi.

Can you finish it from here?  [If the answer does not come out to be an exact number, round down.]

Without any calculations, I would say two times per hour   = 48 times

Are you just guesssing or what?

Angle 1   + angle 4   = 180

  100       + angle 4   = 180  

90.0    rounded to one decimal

By the graph there are 5 yellow, 5 red, 5 orange, 5 blue, and 5 green.

In total, there are 5 + 5 + 5 + 5 + 5 = 25.

The percentage, or probability of blue is 5/25.  [Which you will need to change into a decimal.]

Each of the other colors have the same probability.

2. B ?

30 + 12 = 42

1. C

2. C

Ade's age 10 years ago   =    A

        and this was 1/2 the age of his sister   A = 1/2 S

10 years later   Ade is now  A + 10  =12           substitute in the red equation above

    A + 10 = 12

   1/2 S  + 10 = 12

   S=4    (remember this was 10 years ago)

       and sister is S + 10   = 4+ 10 = 14 y/o    Sister's age now

He needs 40 buns and 40 dogs ...so he HAS to spend

40 dogs/10dogs/pkg   x   $ 3.50/pkg = $14       (4 packages dogs)

40 buns/8buns/pkg     x    $ 2.50/pkg = 12.50    (5 packages buns)       14 + 12.50 = 26.50

     He has     70 - 26.50 = 43.50 left to spend

Now any combo that spends 43.50 is allowed as he has met his 40 dog-bun requirement

3.50 y  + 2.50 x = 43.50    

I used a graphical approach to see where x,y pairs are integer values (since you cannot split packages) you will see that

x, y   =   2,11    9,6    and   16, 1     all fit the bill   ....remember you have to add the obligatory red packages above !

y is dogs   x is buns      so    7 b   15 d            14 b  10 d       and   21 b    5 d     all would spend the total $70

Since AF is the perpendicular bisector both angle(AFD) and angle(AFB) are right angles; 

also, BF is congruent to DF.

Since AF is congruent to AF, triangle(ABF) is congruent to triangle(ADF)   ---   side-angle-side.

Therefore, AD = AB = 30 and DF = BF = 12.

You can now calculate AB + BF.