What did the first americans had to depend on for their survival

The Answear to your question would be The first Native Americans depended on their hunting skills, and gathering skills to survive. They learned how to live off the land and respect nature.

angle a = 40.6°

step-by-step explanation:

for any right angle triangle we know the pythagoras theorem reveals

hypotenuse² = height²+base²

by this formula we will calculate the length of hypotenuse

h² = 6²+7²

⇒ h =√36+49 = √85 = 9.22

now from the given triangle sin a = height/ hypotenuse

                                                sin a = 6/9.22 = 0.651

therefore

so angle a = 40.6°

wisdom

explanation:

the fact that that the teachings on the cosmic order comes from, or through, the heart center