Question

A. Use order of operations to simplify:


B. Compare. 2[3(12-7)____ 5x 5-5



C. Translate the words into a mathematical expression.
The number a increased by fifteen is twenty-one.



D. Evaluate the expression.
xyz – 4z when x = 3, y = 4, and z = 5

Answer 1

18-3 2-(6-4) = -2592

Answer 2

A is missing something

it looks like B should have a closing ] like this 2[3(12-7)]

Answer 3

x*

Answer 4

That's the first question.

Answer 5

18-3 x 2-(6-4) = -2592 ?

Answer 6

That's what I got unless I;m doing something wrong.

Answer 7

I'm*

Answer 8

how?

Answer 9

I dont know could you explain all steps

Answer 10

did you learn any rules about what to do first?
PEDMAS is one way to remember, but there are others

Answer 11

Yes, I have learned that.

Answer 12

P stands for parentheses. Do you have any parentheses?

Answer 13

Yes

Answer 14

can you do the arithmetic inside the parens and replace (6-4) with the answer?

Answer 15

-24

Answer 16

are you saying 6-4 is -24?

Answer 17

2

Answer 18

18-3 x 2-(6-4)

now replace (6-4) with your 2
18-3 x 2 - 2

in PEDMAS E is for exponents (I don't see any). D is for divide. nope
M is for multiply
do you see any numbers to multiply in
18-3 x 2 - 2
?

Answer 19

No.

Answer 20

doesn't x mean multiply?

Answer 21

x mines times?

Answer 22

means

Answer 23

yes, or sometimes you see * or just a dot as in \( 3 \cdot 2\)

Answer 24

So, how would I compare that to B?

Answer 25

B is a different question, and does not have anything to do with A.

can you finish A? so far you have
18-3 x 2 - 2

Answer 26

I'm done with A.

Answer 27

what did you get?

Answer 28

18-3 = 15 3x2 = 6 and (6-4) = 2

Answer 29

almost. you start with
18-3 x 2-(6-4)

you do P (parens) first 6-4 is 2 so replace (6-4) with a 2 to get
18-3 x 2 -2

now do M (multiply) 3x2 is 6 replace 3x2 with 6 to get
18 - 6 -2

now do left to right
(18-6) - 2
what do you get?

Answer 30

-110

Answer 31

what is 18-6 ?

Answer 32

12

Answer 33

replace (18-6) with 12 in
(18-6) - 2

can you do that?

Answer 34

we are almost done. can you rewrite
(18-6) - 2
by writing 12 instead of (18-6)

Answer 35

yes.
12-2
and finally
10

Answer 36

can you make question B in a new post? This one is getting too long