Find the exact value of the following question:

$$ 8\sqrt{?}÷14×3+9=21$$

Find the value of $$ {^3\sqrt{\sqrt{.000064}}}$$.

Find the distance between the point (-6, 7) and the point (-1, -5).

If $$ {sin\ θ\ cosec\  θ\over tan θ}=4 $$  then Find the value of tan θ ?

If $$ sin(θ+30^0)= {3\over \sqrt { 12} }  $$ then find cos²θ : 

If x²+y²-4x-4y+8=0, then the value of x-y is: 

Each member of a Picnic party contributed twice as many rupees as the total collection was Rs.3042. The number of members present in the party was 

A starts business with Rs.3500 and after 5 months, B joins with A as his partner. After a year, the profit is divided in the ratio 2:3. What B’s contribution in the capital?