The vertex angle of an isosceles triangle measures 40°. What is the measure of a base angle? 40°
70°
100°
140°

Which expression will have the same sum as 3_8 + 1/4?

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

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.