What is the horizontal range of a projectile fired into the air?

[ihatecats2014]

Homework Statement

Exactly 3.3s after a projectile is fired into the air from the ground, it is observed to have a velocity v = (8.6i + 5.0j ), where the x-axis is horizontal and the y-axis is positive upward.

Determine the horizontal range of the projectile

Homework Equations

x=x₀+v_y0t+1/2at²
v=$$\sqrt{}V_x$$²+V_y²

The Attempt at a Solution

v= 9.95 by finding the resultant of the velocity vector
x _{0 = 0
ax= 0
x= Vx(t)?
is that correct?
if so then,
x= 9.95(3.3)= 32.8?
but this is wrong and i don't know how to get it
wait does R= x? or y?}

 

[kuruman]

Use the information that v = (8.6i+5.0j)m/s in 3.3 s to find the components of the initial velocity vector. Then use the equation that relates the range R to these initial components to answer the question.