Which math expression represents the phrase?
9 times the sum of a number and 7
A.
9 · n + 7
B.
9 · (n + 7)
C.
9 · (n – 7)
D.
9 · (n · 7
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OpenStudy (welshfella):
which one do you think it is?
OpenStudy (jameshorton):
it d
OpenStudy (welshfella):
note that the number is added to 7 first before the multiply
OpenStudy (anonymous):
A
OpenStudy (welshfella):
@jameshorten plz dont just give the answer
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OpenStudy (jameshorton):
yes sir or mam
OpenStudy (welshfella):
d is wrong
OpenStudy (jameshorton):
no it not
OpenStudy (jameshorton):
who ask the question
OpenStudy (jameshorton):
help me on mines
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OpenStudy (welshfella):
Its not A because the multiplication is done first in A
OpenStudy (welshfella):
when you have something in parentheses ( and ) that calculation is done first
OpenStudy (welshfella):
so if i for example had to compute 3* (4 + 7) i would do the 4+7 first then multiply by 3
OpenStudy (niahloves):
so what is it
OpenStudy (welshfella):
the question says' 9 times the sum of a number and 7' - this means the x + 7 will be calculated first therefore x + 7 goes into parentheses
so which one is it?
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OpenStudy (niahloves):
c
OpenStudy (welshfella):
they have n not x That doesnt matter
OpenStudy (niahloves):
is it right or wrong
OpenStudy (welshfella):
why C? that has (x - 7) not (x + 7)
sum = +
OpenStudy (welshfella):
take another look
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