Isentropic flows

For a steady, $1-$D isentropic flow of air, you are given the pressure, temperature velocity at a point $(1)$ to be $60$kPa,$7C$ and $550\frac{m}{s}.$ At some other point $(2)$ in the flow, you are given the pressure is $25$ kPa $.$ At point $2$ determine:

$($a$)$ Mach Number

$($b$)$ temperature

$($c$)$ velocity