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The reason I didn't respond to the original question is because it's locked

Really?

Well....if they do not have cell WALLs   they do not have separate cells....

Since they are similar triangles, their sides are SIMILAR lengths....

One triangle has side length of   35    the other similar side in the OTHER triangle is 75 ft...

   you can make a ratio of the side lengths  35 is to  75     35/75   is the ratio of similar sides in the two triangles

       now they tell you DE is 21 feet.....and we are looking for the SIMILAR side in the other triangle, BA

          these two sides will be in the same ratio    35/75

             so you can say something like this   35 is to 75      as DE is to BA      and we know DE is 21, so this looks like this:

                                  35/75 = 21/BA          now solve for BA       ...   can you do that now?

could you help me with B please...and explain it to me..?

The y-intercept is y = -5, the midline should also be -5. 

The wavelength should just be 2π?

The amplitude is -1?

yes....

 Trying my best.

no, I haven't... D: 

 A is similar because of the AAA theorem?

Just play around with the graphing tool to see what the parameters do when you change them'

a sin (x+b)  + c           a    amplitude change       b    shift L or R       c    shift up or down     etc

It is very hard for you PC becasue you are missing so many of the basic concepts.

Put most of your effort into basic concepts and if you are lucky the other will clink into place afterwards.

Kind of, I'm still really shaky on a lot of these concepts, even at their basics, but my teacher keeps rushing us through so many things its hard to keep up alongside other schoolwork. 

3 sin (pi/10  (x+5) )

3   is the amplitude     from midline the graph goes up 3   and down 3

+5    shifts the graph right ....so you can have high point at t= 0

pi/10   changes period from 2pi    to  20           2 pi / x  = 20        x = pi/10   

yes ...points are ok   first is at midline     second is at minimum

  do you understand HOW to plot the graph given the information in the Q?

Yes that is great EXCEPT

The midline is   y=6       you cannot say that it is just 6

I think you are starting to get the hang of these.

How about 

y=sinx   - 5

what effect do you think the -5 will have?

so for y=sinx -5  what would be

a) the y intercept

b) the midline

c) the wavelength

d) the amplitude.

See if you can graph it by hand and then check it with Desmos graphing calculator.

Practice graphing y=sinx   you must know what these very basic parent graphs look like.

Yes they are similar triangles     angle   angle   angle        all three angles in each triangle are equal

Have you tried 'b' yet? ....similar triangles

Would it be appropriate to put the points here then?

Oh, oops. One moment then. 

Hi and thanks Geno.

Geno's answer is not queite right because Geno made a careless error.   The denominators must reduce.

It is without replacement.

Better or worse?

If you want to peek at what the wave should look like see here:

https://www.desmos.com/calculator/dt2d8lubmv

Short answer :   No...it is not correct.

at t= 0 it should be at it's highest point

period is supposed to be 20     you have 16

difference between highest and lowest point is supposed to be 6      yours is much more...

   also, you do not have midline resting position at y=0

try to rework it and come back......

I tried that but it didn't work, I don't know what could have gone wrong, it looks like the right answer to me.

This could be done in two ways:     orange - purple - orange     or     purple - orange - purple

orange - purple - orange  =  (4/9) x (5/9) x (3/9)  =  60/729

purple - orange - purple   =  (5/9) x (4/9) x (4/9)  =  80/729

To find the final probability, add these two probabilities together.

Use the Pyhagorean Theorem from the origin to the top of each tree.

In one case, distance = sqrt( 10² + 14² ).

In the other case, distance = squrt( 13² + 9² ).

Find each distance to determine the answer to the problem.