Someone explain what i ! i dont understand!

it says

find the indicated measure in abcd. explain your reasoning.

i am doing a quiz today and this is review work. i seriously need someone to explain this to me asap.

Given the following linear function sketch the graph of the function and find the domain and range. ƒ(x) = -5x + 4

Jonah buys a television that costs $445. sales tax in his state is 7 percent. which of the following expressions represent the amount of tax on the television?

Which statement is true about the local minimum of the graphed function? over the interval[-4,-2], the local minimum is 0. over the interval [-2,-1] , the local minimum is 25. over the interval [-1,4], the local minimum is 0. over the interval [4,7], the local minimum is -7