1. what is the measure of ∠abc? what is the measure of ∠abd?

The number of branches on a tree demonstrates the fibonacci sequence. how many branches would there be on the next two levels of this tree? 13 | | | m branches

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

The distance between two points is 6.5cm and scale of map is 1: 1000 what's the distance between the two points