Answered

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Find the value of the expression [tex]21-2a[/tex] if [tex]a=3[/tex].

A) 27
B) 16
C) 57
D) 15

Sagot :

GinnyAnswer
To find the value of the expression [tex]\( 21 - 2a \)[/tex] when [tex]\( a = 3 \)[/tex], follow these steps:

1. Substitute the given value of [tex]\( a \)[/tex] into the expression:
[tex]\[ 21 - 2a \][/tex]
When [tex]\( a = 3 \)[/tex], the expression becomes:
[tex]\[ 21 - 2 \times 3 \][/tex]

2. Perform the multiplication first, according to the order of operations (PEMDAS/BODMAS):
[tex]\[ 2 \times 3 = 6 \][/tex]

3. Substitute the result of the multiplication back into the expression:
[tex]\[ 21 - 6 \][/tex]

4. Perform the subtraction:
[tex]\[ 21 - 6 = 15 \][/tex]

Thus, the value of the expression [tex]\( 21 - 2a \)[/tex] when [tex]\( a = 3 \)[/tex] is [tex]\( 15 \)[/tex].

Therefore, the correct answer is:
D) 15
wegnerkolmp2741o

Answer:

D) 15

Step-by-step explanation:

21-2a

Let a =3

21 - 2(3)

Multiply the 2 and 3.

21 -6

Subtract.

15

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