Which property of equality was used to solve this equation 9x = 88

9x/9=88/9

X+9 7/9

A. addition property of equality

B. subtraction property of equality

C. multiplication property of equality

D. division property of equality

Step-by-step explanation:

Given the equation 9x = 88, to get the value of x we will apply the division property of inequality. The division property of equality is the property applied to an expression by dividing both sides of an expression with the same constant without compromising the equality sign i.e after division, the expression at both sides of the expression still remains unchanged.

From the expression

9x = 88

Divide both sides by the coefficient of x i.e 9 (division property of equality)

9x/9=88/9

x = 9 7/9

Hence the property that was used to solve the equation is the division property of equality

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

4932,9180,7625 are divisible by 9