Question

Which expression is not equivalent to the other expressions?

Answer 1

a. \[7 + 0.5 \times 4^{2}\]

b. \[2.5 \times (16 - 2^{2})\]

c. \[(3^{3} + 3) \div 2\]

d. \[(20 + 5^{2}) \div 2\]

Answer 2

Did you try simplifying each expression?

btw, make sure there are no typos in the question...

Answer 3

until i find the different one right? @phi

Answer 4

what do you get for
7+0.5×4^2 ?

Answer 5

@phi 120

Answer 6

remember order of operations

do exponents first, the multiply, then add

Answer 7

7 + 0.5 * 4^2

first do 4^2 which means 4*4. you get 16
7 + 0.5*16

now do the multiply.

Answer 8

@phi
\[7+0.5 \times 4^{2} = 120\]

\[2.5 \times (16-2^{2}) = 30\]

\[(3^{3} + 3) \div 2= 15\]

\[(20 + 5^{2}) \div 2= 12\]

Answer 9

the first one is not 120. try again

Answer 10

@phi but the others are right?

Answer 11

last one is wrong also.... and I think there is a typo somewheres. But first things first, what is the first expression ?

Answer 12

@phi hold on I have someone from my family also helping and he wants to know if its d.

Answer 13

what is the first expression ?

Answer 14

7 + 0.5 x 4^2 and if you follow PEMDAS you first do the eponets

Answer 15

@phi

Answer 16

yes, what do you get ?

Answer 17

@phi 16 because 16= 4 x 4

Answer 18

what is 7 + 0.5 x 4^2 ?

4*4 is 16, so now what is
7 + 0.5*16 ?

Answer 19

@phi I did a typo on D. its divided by 3 not 2

and

8 then add 7 and its 15

Answer 20

ok so we have
a 15
b 30
c 15
d (20+5^2)÷3 = (20+25)/3 = 45/3 = 15

which one is different ?

Answer 21

b. ... oh i get it ty for correct me!

Answer 22

this question tested if you know Order of operations (Can you follow rules ?)

Answer 23

@phi yes I love order of operation im very good at it but when im not focused not at all

Answer 24

btw, when you did d.) with the typo (divide by 2 instead of 3)
you got 12 ?!

you should have gotten (20+5^2)/2 = (20+25)/2 = 45/2 = 22.5
which is not 12.

Answer 25

@phi i did the wrong order oops

Answer 26

ok, just so you know how to do it correctly, because if don't understand order of operations, the rest of math assumes you know it, and you will get lost if you don't know them.