A road has a gradient of 1/15 for 90 m. Then there is a horizontal section 130 m long.
The final section has a gradient of 1/25 for 200 m.
a. Find the total height gained from start to finish.
b. What is the average gradient from start to finish?

I did the first part of the question and got 14 m which is right but then I don't understand the second part (b.) Could someone explain it to me, please?

the answer is 31.27mph

answer: 800

step-by-step explanation:

55.44 inches

step-by-step explanation:

part a. assuming a perfectly linear relationship, we can find the slope from the first two data points.

slope = m = (change in rainfall)/(change in years)

= (61.80 -62.33)/(2005 -2004) = -0.53/1 = -0.53

then the point-slope form of the equation of the line can be written as

y = m(x -h) +k . . . . . m = -0.53, (h, k) = (0, 62.33)

y = -0.53x +62.33 . . . x = years after 2004

part b. in 2017, x = 2017 -2004 = 13. then the predicted rainfall is

y = -0.53·13 +62.33 = 55.44 . . inches

the predicted rainfall in 2017 is 55.44 in.