Which of the following is not a river in africa?
indus
a. niger
b. tigris
c. zambezi
d. congo

Find the equation of the line passing through the point (–1, 5) and perpendicular to the line 3x + y = 4.

Some gamma ray bursts are hypothesized to come from mergers of neutron stars or black holes. if this hypothesis is correct, what else should we in principle be able to detect from such mergers? a. gravitiational waves b. x-ray bursts c. significant disruption of gas thousands of light-years away in the surrounding galaxy d. an "afterglow" of bright visible light, lasting for weeks

Both pictures below were taken at the same time of day, but one picture was taken in summer, and the other in winter. how can you tell which is in winter