-

a)

p + q = 4•7 x 10^5 + 3•92 x 10^7

p + q = 10^5 ( 4•7 + 392 )

p + q = 396•7 x 10^5

p + q = 3•967 x 10^7

b)

q + p = p + q = 3•967 x 19^7

p = 4.7 x 10^5 and  q = 3.92 x 10^7 

(a) p + q

(b) q + p

(a) = (b)

= 470,000 + 39,200,000

= 39,670,000

= 3.97 x 10^7

assuming p = P...

p + q = q + p = 4.7x10^5 + 3.92x10^7

= 0.047x10^7 + 3.92x10^7

= 3.97x10^7 (rounded)