Question

1) Find the value of n:



a) 12n = 144

Solution: RHS 144= 12X12 = 122

12n = 122

Equating powers because base is same

n = 2

b) (2/8 )2n X (2/8 )n = (2/8 )6 c) 72n+1 ÷ 49 = 73 d)(-5)4 ÷ (-5)2 = (-5)n



2) Simplify the following:



a) ( a8 X a-5)0 b) [(z)2]4 c) (25÷28) ÷ 28





3) The size of a plant cell is 0.00001275 m, Express it in standard form with exponents.



4) Write the following numbers in expanded form:



a) 7 X 107 b) 2.54 X106​

Answer 1

Answer:

sorry friend.........