Please help me with these two problems
Up to a certain height the temperature above sea level can be modelled by a linear function of height h in meters. At the height 500m the temperature is 15 degrees celsius, at a height of 10 000m the temperature is -80 degrees. Determine an equation for the relation between height and temperature.
I tried calculating the gradient, but I always got the wrong answer.
The width of the canal is 10.0m and the greatest depth is 5m. The cross-section of the canal has the shape of a parabola.
How far from the bank is the depth 2.5m?
I have tried everything, from trying to find the zero points to finding the axis of symmetry and nothing works.
Please help me, I am grateful for any help, no matter how little.