ellenabbott ellenabbott

16-05-2016
Mathematics

contestada

sorry for all the math questions but I do not understand this at all. someone explain and write the equation for me please?? they are the exact words... doesn't make sense to me:

the sum of three times a number (z) and 15 is equal to 21.

Respuesta :

Petroniusz Petroniusz

16-05-2016

3Z + 15 = 21 equation

1. solution
3Z + 15 = 21
3Z = 21 - 15
3Z = 6 [:3
Z = 2

2 solution
3Z + 15 = 21 [:3
Z + 5 = 7
Z = 7 - 5 = 2

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