9/10 = d/6.4 what does d equal

Which graph represents an even function?

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

If, while training for a marathon, you ran 60 miles in 2/3 months, how many miles did you run each month? (assume you ran the same amount each month) write your answer as a whole number, proper fraction, or mixed number in simplest form. you ran __ miles each month.