"which step should be used to prove that point a is equidistant from points c and b?
in triangles abd and acd, all three angles are equal.
in triangles abc and abd, one side and one common angle are equal.
in triangles abc and adc, two sides are unequal.
in triangles abd and acd, two sides and an included angle are equal. "

Element x decays radioactively with a half life of 8 minutes. if there are 450 grams of element x, how long, to the nearest tenth of a minute, would it take the element to decay to 37 grams?

Aplane is taking off from bangladesh headed to new york city. at the same time, a plane from new york city is headed to bangladesh is also taking off. the plane bound to new york city is traveling at 600 mph, while the plane traveling to bangladesh is traveling at 400 mph. how far from new york city will the two planes meet if the distance between new york city and bangladesh is 8,000 miles?

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.