Please if you don't know don't answer. Simplify 7a - 3(b - a). Please show working, i mean step by step.​

In the poem, collins suggests that memories do what as people age

Who first discovers the alien cylinder on horsell common

They also make slight swaying movements to mimic leaves and grass moved by the wind. based on the text, to mimic is most likely which of the following? avoid copy make mock