In the diagram, the measure of angle 9 is 85°
Which angle must also measure 85°?
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Please help, need answer ASAP !! :)

Abari owns 100 shares of stock a and 45 shares of stock b. for the past month, his stocks have been fluctuating inversely. stock a decreased by m cents per share and stock b increased by n cents per share. which equation can be used to find the total change in value of jabari's shares per month?