Question #5160

Sizes of envelopes. Rhetoric Advertising is a direct-mail company. It determines that for a particular campaign, it can use any envelope with a fixed width of 3½ in. and an area of at least 17½². Determine (in terms of an inequality) those lengths that will satisfy the company constraints.

Expert's answer

We know that the area of rectangle is calculated:*A=wl* where w-width, l-length and A is an area of a rectangle

w=7/2 - fixed

7/2*l *>=35/2 =>* l *>=35/7 =>* l *>=5

At least means that it’s more then 17 and width is constant.

w=7/2 - fixed

7/2

At least means that it’s more then 17 and width is constant.

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