I hope it helps you
You are arranging 70 plants in a rectangular garden with the same number of plants in each row. How many ways can you arrange th
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Angle QRT is an exterior angle to the triangle. The rule is that the exterior angle of a triangle is equal to the sum of its remote interior angles. Those remote interior angles are angle RTS and angle TSR. So our equation is 
. We can remove the parenthesis and simplify by combining like terms to get 9x = 5x + 9 + x and 9x = 6x + 9 and 3x = 9. That means that x = 3.
I have attached the graph. I did this using desmos.com. Try it out sometime. I hope that helps.
