The answer for this would be
C = 5000 + 200t
The interior angel to ∠7 is the angel ∠4
because ∠7 + ∠4 = 180°
The correct choice is number 1
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A=-26/11 —> you will solve for a by simplifying both sides of the equation, then isolating the variable.
B. 5.5×(7.5×6.4) =(5.5×7.5)×6.4