Which value is equivalent to (8⋅78⋅4⋅2​)^2×(7−380​)^3 × 7−9?
A. 64/49
B. 8/49
C. 16/7
D. 512/7
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Sasha drank 8 bottles of water everyday for a week. how many bottles of water did she drink in total?

It took alice 5 5/6 hours to drive to her grandparents' house for . on the way home, she ran into traffic and it took her 7 3/8 hours. how much longer did the return trip take? write your answer as a proper fraction or mixed number in simplest form. the trip home took __hours longer. ?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle