Which of the following parabolas opens up? a. directrix: y = 2; focus: (−3, −5) b. directrix: y = 2; focus: (3, 5) c. directrix: y = −2; focus: (3, −5) d. directrix: y = −2; focus: (−3, −5)

To complete your spring schedule, you must add calculus and physics. at 9: 30, there are three calculus sections and two physics sections; while at 11: 30, there are two calculus sections and three physics sections. how many ways can you complete your schedule if your only open periods are 9: 30 and 11: 30?

Which statement accurately explains whether a reflection over the x-axis and a 180° rotation would map figure acb onto itself?

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.