If it is true that z2 – 6 = 19, then z2 + 6 = ?

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The conversion factor relating feet to meters is 1 ft=0.305 m. keep in mind that when using conversion factors, you want to make sure that like units cancel leaving you with the units you need. you have been told that a certain house is 164 m2 in area. how much is this in square feet?

How to do this , and can some one explain

What is r i 4.5+10r=-6.5 with work pls