3. a submarine dives at an
angle of the surface of the
water. the submarine travels
at a speed of 760 feet per
minute. about how deep is the
sub after 5 min?

The height of deepness of submarine is 424.1 feet  

Step-by-step explanation:

Given as :

The angle at which submarine drives of the surface of water = Ф = 13°

The speed at which submarine travel = s = 760 feet per minute

Let The height of deepness of submarine = h feet

The time taken to reach that deepness = t = 5 minutes

According to question

The height of deepness of submarine =

i.e h × cos(90 - Ф) =

Or,  h × Sin(Ф) =

Or,  h × Sin(13°) = 95 feet

Or,   h × 0.224 = 95 feet

∴  h =

i.e h = 424.10 feet

So, The height of deepness of submarine = h = 424.10 feet

Hence, The height of deepness of submarine is 424.1 feet  Answer