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Mathematics 12 Online
OpenStudy (skullcandy229):

Two-fifths of a number is decreased by three. Find the value of the expression if the number is twenty-five.

OpenStudy (anaise):

2/5 of 25 is 10, minus 3 is 7.......right?

OpenStudy (skullcandy229):

yes i think

OpenStudy (anaise):

or it could be 12

OpenStudy (shadowlegendx):

How could it be 12, lol

OpenStudy (shadowlegendx):

Itʻs 7

OpenStudy (shadowlegendx):

Agred?

OpenStudy (anaise):

i was thinking sumthin else

OpenStudy (anaise):

marking coordinates on my globe

OpenStudy (shadowlegendx):

waaat

OpenStudy (shadowlegendx):

Iʻll mark your globe

OpenStudy (shadowlegendx):

;)

OpenStudy (skullcandy229):

one more thing Evaluate the expression w square - v + 1 for w = -2 and v = -8.

OpenStudy (anaise):

anywaay

OpenStudy (anaise):

hold up

OpenStudy (shadowlegendx):

\[-2^{2} -(-8) + 1\]

OpenStudy (shadowlegendx):

I got that from the original equation \[w ^{2} - v + 1\]

OpenStudy (shadowlegendx):

Do you know how to solve that?

OpenStudy (anaise):

ugh.......brb

OpenStudy (shadowlegendx):

You just have to follow the Order of Operations

OpenStudy (anaise):

PEMDAS

OpenStudy (shadowlegendx):

^ Parentheses Exponents Multiplication Division Addition Subtraction

OpenStudy (shadowlegendx):

Lets start with parenthesis -(-8) This is basically saying + 8 Hereʻs why |dw:1448913528952:dw|

OpenStudy (shadowlegendx):

Just think of it as "plus, plus" |dw:1448913681583:dw|

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