A drone costs $400 with $15 plus for each set of extra propellers. Write a function that models the cost (c) of a drone with x amount of extra propellers.

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

Find the domain and range of the following function f(x) = 51x - 21+ 4

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.