Please help me! I need help, and I can give brainliest. 1. What is the length of diagonal PS?
A. 19.9 in
B. 23.9 in
C. 18.6 in
D. 39.9 in

2. What is the area of rhombus ABCD?
A. 24.57 cm^2
B. 98.28 cm^2
C. 39.00 cm^2
D. 78.00 cm^2

3. What is the length of diagonal RQ?
A. 9.3 in
B. 11 in
C. 22 in
D. 18.6 in

4. What is the measure of angle P?
A. 90°
B. 35°
C. 55°
D. 70°

Thank you so much!

i do not know

Step-by-step explanation:

look it up

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