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Which is equivalent to the expression?
1/2(13-5)+(4+8)^2

A. 148
B. 144
C. 20
D. 16

Multiple choice questions also
If anyone could help me with this one also!

Which is equivalent to the expression
8 x 9+4^2-(63/7)

A. 1143
B. 88
C. 79
D. 65

Thank you to anyone who helps me I greatly appreciate beyond measures! :)

Sagot :

altavistard

Answer:

Step-by-step explanation:

1/2(13-5)+(4+8)^2

A. 148

B. 144

C. 20

D. 16

We must follow "PEMDAS" order of operations rules.  Anything inside parentheses must be done first, followed by exponentiation, multiplication and division, and finally additionl and subtraction.

1/2(13-5)+(4+8)^2 has three sets of parentheses enclosing mathematical expressions:  (1/2), (13 - 5) and (4 + 8).  These evaluate to:

                        1/2,       8,               12

and so we now have (1/2)(8) + (12)^2

Exponentiation is next.  We get:  (1/2)(8) + 144

Next is multiplication:                         4      + 144

Last is addition:                                       148

Answer A is correct:  148

8 x 9+4^2-(63/7)

is evaluated in the same way:

8 x 9+4^2-(9), followed by exponentiation:

8*9 + 16 - 9, followed by multiplication:

72 + 16 - 9 = 79 (Answer C)

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