Over the last 2.5 years, the water level in a lake has changed by -0.3 feet per year. Scientists predict that the water level will continue to go down for the next 5 years at a rate of 0.4 feet per year. What rational number represents the overall change of the water level after 7.5 years?

10a^3+277a^2-132a-792

step-by-step explanation:

(2a+11)(5a-12)(foil)

=10a^2-24a+55a-132 =10a^2+31a-132

(10a^2+31a-132)(a+6)

=10a^3+60a^2+31a^2+186a^2-132a-792 =10a^3+277a^2-132a-792

i hope this is what you are looking for : )

idk the answer but just put a

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what was your answer?