eliseeimbody
06.10.2019 •
Mathematics
Sorry for all the math questions but i do not understand this at all. someone explain and write the equation for me ? ? they are the exact doesn't make sense to me:
the sum of three times a number (z) and 15 is equal to 21.
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Ответ:
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
Ответ:
=
Step-by-step explanation:
Given:
As the power of 10 are same in both the values:So, there is no need of shifting the decimal places to make the power of '10' equal:Taking '' common from the expression:
Subtracting the values inside the bracket:The expression is written as: