Question

MEDAL!!!!
20. Combine like terms. What is a simpler form of each expression?
9c-6d+4c-3d

Answer 1

9c + 4c - 6d - 3d.

9c + 4c = 13c,
so overall, it simplifies down to 13c - 9d.

Answer 2

okay thanks one question! 6d-3d=3d? so wouldn't it be 13c-3d?

Answer 3

What are your answer choices?

Answer 4

there are no answer choices

Answer 5

@butterflydreamer

Answer 6

Do you know how to simplify?

Answer 7

yes

Answer 8

so 13c-9d is the answer?

Answer 9

let me check

first we rearrange the terms
9c+4c-6d-3d

Answer 10

we are just adding for c
9c+4c = 13c

we are dealing with negative numbers for d
-6d-3d = -9d

so let's modify the problem

9c+4c+6d-3d

Answer 11

the c portion remains the same.. we just have to figure out what 6d-3d is

Answer 12

3d

Answer 13

mhm so the answer is 13c+3d

Answer 14

yes thanks

Answer 15

When we are dealing with problems like -6d-3d both of these numbers are negative so the negative sign remains and your number should increase
the problem can also be re-written as -6d+(-3d) but normally the + sign is dropped because writing 2 signs at once is frowned upon, so it becomes -6d-3d

6d-3d is just normal subtraction.

Answer 16

oh.. so 13c+9d is the answer

Answer 17

sort of .. the negative sign stays for -6d-3d

Answer 18

-6d is negative
-3d is also negative
-6d-3d produces a bigger negative number..
d(-6-3) (I factored out the d to make it easier to see that -6-3 = -9)

Answer 19

so 13c+9d is the answer

Answer 20

. 13c-9d was the correct answer... I typed that we have a negative number and another negative number.... which is -6d-3d .. that negative sign stays.

Answer 21

I'll use a number line

Answer 22

we have the problem -6-3... I start at -6

Answer 23

-3 means I have to move 3 units to the left.
-6-3 = -9