Jim is a minor manufacturer. He needs to know the forecasted sales for September to formulate a plan in advance. What is his forecasted sale using simple average method.

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

answer: the answer is ann

answer: 1+1

step-by-step explanation: 1+1 is at least 2