Question

Need help check a answer


What is the perimeter of a triangle with the given side lengths?

s1 = x + 4 cm
s2 = 3x + 1 cm
s3 = 7x + 3 cm

Is it (11x)+(7)?

Answer 1

@skullpatrol

Answer 2

ok, perimeter you add them right?

Answer 3

That's what did, I hope I'm right

Answer 4

The x part is correct.
Check the numbers part.

Answer 5

yes, now add the x's first. x+3x+7x=?
Now the numbers:4+1+3=?

Answer 6

x + 3x + 7x = 11x since x is the same as 1x.
What is 4 + 1 + 3?

Answer 7

4 and x aren't the same

Answer 8

yep

Answer 9

well then why 1x + 4 + 3?

Answer 10

Oh wait nvm

Answer 11

I forgot the other 1 sorry

Answer 12

so is it (11x)+(8)?

Answer 13

Yep!

Answer 14

kk I'll wait till mathstudent is done

Answer 15

We are adding these three lengths:

\((x + 4) +(3x + 1) + (7x + 3) \)

Since we only have additions, we can drop the parentheses to give us:

\(=x + 4 +3x + 1 + 7x + 3 \)

Using the commutative and associative properties, we can change the order and grouping:

\(= x+ 3x + 7x + 4 + 1 + 3 \)

\(= (x+ 3x + 7x) + (4 + 1 + 3) \)

Now we combine like terms. Remember that x is the same as 1x, so we get:

\(= 11x + 8\)

Answer 16

Ah, ok thanks mathstudent! I'll fan you

Answer 17

@LoveIt
You are correct. You don't need the parentheses, but your answer is still correct.

Answer 18

kk, ty!

Answer 19

cya

Answer 20

YAY I GOT 100%

Answer 21

Thanks to you guys!

Answer 22

your welcome!