What is 0.685 written in scientific notation?
explain why

685×
10
−9

68.5×
10
−8

6.85×
10
−8

6.85×
10
−7

Afruit stand has to decide what to charge for their produce. they need $10 for 4 apples and 4 oranges. they also need $15 for 6 apples and 6 oranges. we put this information into a system of linear equations. can we find a unique price for an apple and an orange?

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

0if x and y vary inversely and y=6 as x=7, what is the constant of variation?