4 kg of water was added to a 1.2 kg iron
boiler. How much
heat must be
supplied to the boiler
to heat the water in it
from 16 °C to 90 °C

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k