Question

Challenge questions 1

Answer 1

9)

`(24z^(5)y^(4))/(3z^(-2)y^(5)) = (24)/(3)*(z^(5))/(z^(-2))*(y^(4))/(y^(5)) = (8)/(1) *(z^(5+2))/(1)*(1)/(y^(5-4)) = (8z^(7) )/(y)`

11)

(a²b)³ = a²⁽³⁾b¹⁽³⁾ = a⁶b³

12)

The exponent tells you how many places to move the decimal. The positive/negative sign tells you which direction to move the decimal (negative is left, positive is right).

8.4 x 10⁻⁵ move the decimal 5 places to the left = 0.000084