Answer:
3x-21
Step-by-step explanation:
3*x+3*(-7)=3x-21
I'm sorry for been so late.
Rational Numebers: a rational number is any number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q. For example: 1，2，3,-1，-2，-3
Irrational Numbers: an irrational number is a real number that cannot be expressed as a ratio of integers. For example: 1/3, 1/7 , 1/9
Real Numbers: a real number is a value that represents a quantity along a continuous line. For example: all rational and irrational numbers.
Whole Numbers: A member of the set of positive integers and zero. A positive integer. An integer. For example: 142， 20， 1
Answer:
Step-by-step explanation:
Given
Probability that an inspector doe not identify low-quality timber=0.20
(a)Probability that both inspector do not identify a low quality timber
(b)Let n be the no of inspector
Probability should be less than 1%=0.01
so 
Taking 
both sides
x>2.861
thus minimum value of x is 3
(c)From part b it is clear that minimum 3 officer are required to to keep the low quality timber below 1%
on an average 2 officer are not sufficient to identify 4 low quality timber out of 100
Answer:
8,888.888
Step-by-step explanation:
