Create and solve a linear equation that represents the model, where circles and a square are shown evenly balanced on a balance beam. A. + 7 = 12; x = 5
B. x = 5 + 7; x = 12
C. x + 5 = 7; x = 2
D. x + 7 = 5; x = -2

C

Step-by-step explanation:

We can notice that the balance beam has in one side 7 balls and in the other one 5 balls and a square

The balance beam is balenced

Let x be the square mass

The solution is 2

C fits perfectly what we prooved

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70