Which of the lines graphed has a slope of 1 and a y-intercept of -3?

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Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

The random variable x has probability density function f (x) = k(−x²+5x−4) 1 ≤ x ≤ 4 or =0 1 show that k = 2/9 find 2 e(x), 3 the mode of x, 4 the cumulative distribution function f(x) for all x. 5 evaluate p(x ≤ 2.5). 6 deduce the value of the median and comment on the shape of the distribution.

Me because i don't understand how to do it.: )