The scientists thought a certain artificial sweetener used in foods and soft drinks could be the cause of changes in mood and sleep
patterns in people who used those products frequently.

Volcanic irruption is most likely to be violent when a) volcanoes near to the sea b) the neck of the volcano is sealed by a plug c) the lava is viscous d) the lava reaches the surface through a fissure e) the volcano is on the ocean floor

In the diagram below dab and dac are adjacent angles

If the basis of an isosceles trapezoid have lengths of 11 and 26, what is the length of the median?