Question

PLZ HELP THIS IS REALY CONFUSING EQUATION!



What value of s makes the statement true?



(–7 + s) + (–14) = (12 + (–7)) + (–14)



A.


–30


B.


–12


C.


–7


D.


12

Answer 1

@paki

Answer 2

im confuzled

Answer 3

(-7 + s) + (-14) = (12 + (-7)) + (-14)


lets look at the left hand side first
(-7 + s) + (-14)

can you simplify this?
(the parenthesis are really necessary here)

Answer 4

yes

Answer 5

-7 + -14 = -21

Answer 6

yes?

Answer 7

that good,

and we keep the s

so you have
s - 21

for the left hand side

Answer 8

ok

Answer 9

*that is good!

Answer 10

so now the right hand side

(12 + (-7)) + (-14)

can you simplify these,

start by simplifying
(12 + (-7))

Answer 11

that = 5?

Answer 12

yep!,

so, now
(5) + (-14)

Answer 13

-9

Answer 14

excellent,

so that is our right hand side,

we have
s - 21 = -9

Answer 15

can you solve this for s?

Answer 16

oh ok! i get it!

Answer 17

yes

Answer 18

here is a medal

Answer 19

hmm i see a simpler method

(-7 + s) + (-14) = (12 + (-7)) + (-14)

if we rearrange the left hand side
...
(s -7) + (-14) = (12 + (-7)) + (-14)

Answer 20

...
ie
(s + (-7)) + (-14) = (12 + (-7)) + (-14)