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

A car is driving at a speed of 60 mi/hr. What is the speed of the car in feet/min? Find the rank and nullity of the matrix
1 2 1 -1
2 3 2c+2 1
2 4 c+1 -2
1 2 c csquared-2

for all possible values of the parameter c.