What is alpha decay scheme and beta decay scheme ? Plz elaborate ! Also plz give the solution of the attachment

Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and thereby transforms or `decays` into an atom with a mass number that is reduced by four and an atomic number that is reduced by two.In beta minus (β−) decay, a neutron is converted to a proton and the process creates an electron and an electron antineutrino; while in beta plus (β+) decay, a proton is converted to a neutron and the process creates a positron and an electron neutrino. β+ decay is also known as positron emission.

Kindly solve the question asked , please.....Also how to solve such questions can u explain??How these decays occur ?