Suma dintre dublul primului numar si triplul celui de-al doilea numar este 117.primul numar este de trei ori mai mare decat al doilea. aflati numerele.

How to do this , and can some one explain

Піf x = y and y= z, which statement must be true? оа. -x = -2 b. x= z ос. —x = 2 od. 2= x

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?