Answer:
Option C
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(-5)^2=25
25
-------------
-15 + - 5
25
------
-20
=-1.25
4/9 of 15/8 means 4/9 * 15/8 = (4*15) /( 9 * 8) = 5/6
Average speed= total distance travelled/ total time taken
a. s. = 510/ 5
average speed= 102 miles/ hour