exam Maths Puzzle Numerical Ability

Please help with the inverse of the one-to-one function

f(x)= cubed sqrt (under square root is x-6)

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exam Other Question

Pablo is driving 40 miles per hour. After he has driven 30 miles, his brother Ricardo starts driving in the same direction. At what rate must Ricardo drive to catch up with Pablo in 5 hours? CONVERT THE RATE INTO THE GIVES UNITS

1) 20 mi/h to feet per second

2)1 gal/h to ounces per second

3)50 km/h to miles per hour