exam
Maths Puzzle
Numerical Ability
Evaluate and write the result using scientific notation:
(4.7 x 10^-7)(1.8 x 10^9)
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exam Other Question
which of the following is equal to the rational expression when x ≠ -1 or -7?
(x+1)(x-1)/(x+7)(x+1)
a.x+1/x+7
b.x+7/x-1
c.x-1/x+7
Kristy can mow a lawn in 1 hour less time than her brother steven. together they can fiinish in 5 hours. how long would it take kristy if she worked alone