I need to know what is the un given side by using Soh Coa Toa

1.68 km

Step-by-step explanation:

You want the horizontal distance (on the ground) from beneath the helicopter to the vertex of the 37 degree angle.  The hypotenuse is given and is 2.1 km.

We want to find the horizontal distance when we already know the angle and the hypotenuse.

That horizontal distance could be called 'x.'   Then:

x/r = adj/hyp = cos 37 degrees, which becomes adj = (2.1 km)cos 37 degrees, which is found using a calculator:  adj = (2.1 km)(0.7987)  =  1.68 km

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

if you would like with a question it is easy to get an answer by including some or multi choice options

step-by-step explanation: