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Find the value of x for which abcd must be a parallelogram -9-6x x-30

Plz hurry evaluate the expression a+b where a=8 and b=19

One astronomical unit (1 au) is about 1.496 alt tag missing. kilometers. if you wrote this number of kilometers in regular decimal notation (for example, 528 and 3,459 are written in regular decimal notation), how many zeros would your number have?