Question

Pls help me with maths I will give medal =)

David makes and sells chairs. The function p(x) = –10x^2 + 100x – 210, graphed below, indicates how much profit he makes in a month if he sells the chairs for 9 – x dollars each. What should David charge per chair to make the maximum profit, and what is the maximum profit he can make in a month?

A $40 at $5 per chair
B $50 at $7 per chair
C $40 at $7 per chair
D $50 at $5 per chair

Answer 1

find the highest point (vertex) on the graph then follow the point down to the x-axis, that will be how many chair to make

reading across to the y axis will show what profit the chairs make.

hope this helps

Answer 2

ima try, brb

Answer 3

is it A? @campbell_st