exam Maths Puzzle Numerical Ability

A ship sank at a rate of 90 feet in 10 seconds. Represent this rate of change with an integer.

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exam Other Question

I need some help, please.
Determine the nature of the solutions of the equation:
9t^2-7t=0
a. 2 real solutions, b. 1 real solution, c. 2 imaginary solutions 5=6x-y graph linear

please show me how this is done.. thanks