Solution:
Rosalyn earned = $989 in 44 hour
Excess work = 44 - 40 = 4
Let the regular hourly wage = $x /hour
Overtime hourly wages = $1.5x/hour
40x + 4($1.5x) = $989
40x + 6x = $989
46x = $989
x = 21.5
Hence, Rosalyn's regular hourly wages is $21.5.
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9/20 is the probability that Bob's password consists of an odd single-digit number followed by a letter and a positive single-digit number
It is given that bob's password consists of a non-negative single-digit number followed by a letter and another non-negative single-digit number (which could be the same as the first one).
P (odd single digit number ) = ( 5 odd single digits / 10 non-negative single digits) = (5/10) = 1/2
P (positive single digit number ) = (9 positive single digits / 10 non-negative single digits) = 9/10
The total probability is (1/2) (9/10) = 9/20
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