self Maths Puzzle

The velocity of a falling object is a linear function of the time t it has been falling. If v = 20 when t = 0 and
v = 53 when t = 11, express v as a function of t.

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self Other Question

What is the next number of the following sequence
6,120,504,1320,.....
The ratio of jacks to marbles in the bowl was 2 to 5. If the bowl contained 350 jacks and marbles, how many were marbles?