Answered

Get the answers you need at Westonci.ca, where our expert community is dedicated to providing you with accurate information. Connect with a community of experts ready to provide precise solutions to your questions quickly and accurately. Experience the ease of finding precise answers to your questions from a knowledgeable community of experts.

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

Your visit means a lot to us. Don't hesitate to return for more reliable answers to any questions you may have. We hope this was helpful. Please come back whenever you need more information or answers to your queries. Your questions are important to us at Westonci.ca. Visit again for expert answers and reliable information.