Praxis Dashboard

27

To solve the expression 15 + 3(7 + 1) - 12, we first calculate the parentheses, yielding 8. Then, 3 multiplied by 8 gives us 24. Adding this to 15 and subtracting 12 results in 27.

A) 21

Option A is incorrect because when you calculate the expression correctly, it results in 27, not 21. The math does not support this value based on the operations involved.

B) 25

Option B is also incorrect. The operations performed lead to 27; hence 25 does not satisfy the expression as it does not align with the calculations from the original problem.

C) 27

This option is correct. The expression simplifies accurately to 27 through the proper order of operations: first resolving the parentheses, then multiplication, followed by addition and subtraction.

D) 172

Option D is incorrect as it is significantly far from the outcome of the expression. No combination of the operations as outlined would yield 172, which is an implausible result given the context.

Conclusion

The correct answer is 27, as derived from the accurate calculation of the expression. All other options fail to represent the correct value due to miscalculations or misinterpretations of the operations involved. Thus, Option C stands out as the only valid solution.