Plz ! urgent! tysm, can anyone me solve this question with and without using algebra plz? a lot.

a) 15cm^3

b) 8:16 am

1 liter = 1,000 cm cubic

Area A = 800                                        

in 10 minutes

12 litters=12,000cm

12,000/800=15 cm

Tank A=15 cm ^3

Area B  = 2,000

In 1 minute 5 liters = 5,000 cm^3

5,000/2000 = 2.5 cm^3 in 1 minute

To know  how many minutes to reach 15:

15/2.5 = 6

6 minutes (from 8:10 am to 8:16 am)

5liters x 6 minutes =30 liters = 30,000 cm^3

30,000/2000 = 15 cm^3

54

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