Can yall help me? I will give 100 points please don't scam me.

D and B

Step-by-step explanation:

D for the first question and B for the second one

First photo, I think they are all the same

Second, see below

Step-by-step explanation:

Numbering is by the numbers next to the problem, not the order of the photos

(2) Biggest area  

[] Find a the areas and compare! Area is base x height divded by 2  

[] A  

2 x 4 / 2  

8 / 2  

4  

[] B  

2 x 4 / 2  

8 / 2  

4  

[] C  

2 x 4 / 2  

8 / 2  

4  

[] D  

2 x 4 / 2  

8 / 2  

4

Now, I think this is a trick question and they are all the same areas. I am not 100% sure, but if you do the math that is what you get :)

(1) Drawing heights  

[] The height is from the middle of the base to the point across. For the one on the left you would find the of the base and draw a straight line into the corner across from it at the bottom right.  

[] The one on the right would be the same, but it would go into the narrower corner on the top

(Hopefully this helps and is correct! Have a nice day :D)

i used to know how to do this in 7th but i forget easily

step-by-step explanation:

the value of v.w= -12.

step-by-step explanation:

we are given three vector r,v and w as:

r = < 5, -5, -2> ; v = < 2, -8, -8> ; w = < -2, 6, -5>

we know that r,v and w could also be represented as:

r=5i-5j-2k

v=2i-8j-8k

and w= -2i+6j-5k

where i,j and k are the unit vectors of x,y and z-axis respectively.

also we know that it has the following property:

i.i=1 ; j.j=1; k.k=1

and i.=j.i=i.k=k.i=j.k=k.j=0

i.e. when we multiply two vectors or we find it's dot product we need to only multiply the components of x coordinates with each other; y with each other and z with each other.

hence, v.w= (2i-8j- -2i+6j-5k)

                  = 2×(-2)+(-8)×(6)+(-8)×(-5)

                  = -4-48+40

                  = -12

hence, v.w= -12