Given that 100.48 = x, 100.70 = y and xz = y², then the value of z is close to
Choose one:	A) 1.2	B) 1.45	C) 2.2	D) 2.9	E) none

Rationale: sol . xz = y ² ⇔ ( 10 0.48 ) z ( 100.70 ) 2 ( 10 0.48 z ) = 10 ( 2 × 0.70 ) = 101.40 ⇔ 0.48 z = 1.40 ⇔ z = 140 / 48 = 35 / 12 = 2.9 ( approx ) . answer d
Answer: D