exam Maths Puzzle Numerical Ability

If you find a slope to be undefined can you still put the problem in y-intercept?

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Can someone please help me solve this? I am having a problem.

The height h in feet of an object after t seconds is given by the function h=-16t^2+90t+3. How long will it take th Mary is 4 years older than John. Mr Smith is 5 times as old as John. If John is x years old how old is a Mary b Mr Smith? If the sum of the three ages is 60 years find how old John is.