What is under the sea ?

caves, wrecked ships, wrecked airplanes, fish, plants, sand, cars that people drive into the sea, trash, bones, artifacts, minerals, there's a lot of things under the sea

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°

your answer will be b. improving roads, bridges, and other infrastructure. hope i !