exam Maths Puzzle Numerical Ability

Using transformation - solve each equation:

4/9x = 8

n/2.3 = 5.6

3/5n + 15 = 21

13 - 1/3n = 9

3/4n + 22 = 55

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exam Other Question

If u=<-2,2,-1> and v=<4,-2,1>, find

a.) |u| and |v|
b.) The unit vector of u and v
c.) u.v
d.) u*v
can someone please help me with this problem:

Two lines are parallel if:

a. m1 =(-m2)^-1
b. m1 = -m2
c. m1 = m2
d. None of the above