Find the greatest common factor 6x^2a + 6xa^2

Abike shop sells you a bicycle for $63 and a helmet for $21. the total cost is 150% of what the shop spent originally. how much did the shop spend originally? how much profit did the bike shop earn by selling the bicycle and helmet to you ?

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square