book Maths Puzzle Numerical Ability

suppose that in 2000, the cost of a compact car averaged $13200 and in 2003 the cost averaged $15200. Assuming that the relationship between time(t) and cost(c) is linear, develop

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book Other Question

Does this quadratic equation have a solution and how do I justify?
1. p2-4p+4=0, 2.m2+m+1=0, 3. 3z2+z-1=0 Find a positive or negative number for each letter such that O+N+E=1, T+W+O=2, T+H+R+E+E=3, etc. up to T+E+N=10(Note: it is possible to go from ZERO to TWELVE)