What is the value of (-7+-6i)

a) -9+9i
b) -9-3i
c) -5-3i
d) -5+9i

Which math sentence can be used to determine if the triangle is a right triangle?

896.31 cm= km 100cm = 1m 1000m = 1km a) 0.0089631 b) 0.0089631 c) 8.9631 d) 89.631

Askyscraper is 396 meters tall. at a certain time of day, it casts a shadow that is 332 meters long.at what angle is the sun above the horizon at that time?