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Mathematics 7 Online
OpenStudy (littlediva12459):

Year Invention 1807 Steamboat 1825 Photography 1837 Telegraph 1846 Sewing machine 1869 Hydroelectric power 1876 Telephone 1879 Light bulb 1888 Rabies vaccine 1890 Diesel engine 1897 Airplane In Mr. Tarkiainen’s history class, each student chooses two of the topics listed in the chart above for their papers. How many different pairs can Juliana choose?

OpenStudy (littlediva12459):

@VladthePro

OpenStudy (littlediva12459):

A. 45 B. 30 C. 90 D. 10

OpenStudy (littlediva12459):

B.?

OpenStudy (vladthepro):

Not quite. I would say A.

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