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Mathematics 8 Online
OpenStudy (anonymous):

In mrs.chapmans math class, 2/3 of the students got either an A or a B on the last test. Of these students, 2/5 got a B. What fraction of the class got a B on the last test?

OpenStudy (anonymous):

your first job it to find two fifths of two thirds, i.e. \(\frac{2}{3}\times \frac{2}{5}\)

OpenStudy (anonymous):

that equals 4/15

OpenStudy (anonymous):

actually that is your last job too, because that is all it asks for

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

really

OpenStudy (anonymous):

well thank you

OpenStudy (anonymous):

yeah really yw

OpenStudy (anonymous):

i gave you a medal

OpenStudy (anonymous):

thank you so much

OpenStudy (anonymous):

thanks !

OpenStudy (anonymous):

can u please help me with another question

OpenStudy (anonymous):

sure

OpenStudy (anonymous):

Queisha spent 1/3 hour answering 9 homework questions for her history class. She spent the same amount of time on each question. What fraction of an hour did it take Queisha to answer each question?

OpenStudy (anonymous):

one ninth of one third i.e. \(\frac{1}{3}\times \frac{1}{9}\) she is a fast worker

OpenStudy (anonymous):

so 1/9 x 1/3

OpenStudy (anonymous):

yes

OpenStudy (anonymous):

oh ok

OpenStudy (anonymous):

one more qick question

OpenStudy (anonymous):

*quick

OpenStudy (anonymous):

kk

OpenStudy (anonymous):

do all squares have two pairs of parallel sides and do all rectangles have four congruent sides

OpenStudy (anonymous):

the answer to the first question is yes, a square has two pairs of parallel sides |dw:1397958190605:dw|

OpenStudy (anonymous):

but how

OpenStudy (anonymous):

"congruent" means equal length, so the answer to the second question is no, since the sides are not necessarily equal

OpenStudy (anonymous):

why are they parallel?

OpenStudy (anonymous):

yeah

OpenStudy (anonymous):

they are parallel because each angle is a right angle

OpenStudy (anonymous):

oh

OpenStudy (anonymous):

|dw:1397958273822:dw|

OpenStudy (anonymous):

|dw:1397958310863:dw|

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