What is the solution to 4 x + 6 less-than-or-equal-to 18?

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If you could answer these your a life saver

The perimeter of a rectangle is 42 inches. if the width of the rectangle is 6 inches, what is the length

As a salesperson you get $50/day and $3.60/each sales you make. if you want to make $60 in one day, how many sales would you need need to make ? a 3b 4c 5d 6 show work.