Which expression is equivalent to j(j)(j)(j)(j)(j)(j)(j)(j)(j)(j)(j)( j)? o 13'
o 13j
o j13
oj + 13

need help fast pls!
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Logan wants to know how many skateboards have defective parts. he inspects 20,000 skateboards and keeps track of the number of defects per board. use his probability distribution table to find the expected value for defects on a skateboard.

Evaluate this using ! 0.25^2 x 2.4 + 0.25 x 2.4^2 − 0.25 x 2.4 x 0.65

In a two-digit number the units' digit is 7 more than the tens' digit. the number with digits reversed is three times as large as the sum of the original number and the two digits. find the number.