Answer:
6
Step-by-step explanation:
hcf stands for "highest common factor"
factors of 12= 1,2,3,4,6,12
factors of 30=1,2,3,5,6,10,15,30
factors of 48= 1,2,3,4,6,8,12,16,24
6 is the highest overlapping factor so its is the "hcf".
first we decompose all numbers into prime factors.
then we write all numbers as the product of its prime factors
then choose the common prime factors with the lowest exponent
and finally calculate the HCF
Answer: 133
171 for 9 hours
171/9 equals 19
So 19 dollars per hour
7 hours times 19 dollars per hour equals 133
7/10 or 0.7
-3/2 (1/3 - 4/5)
(-3/2) (1/3 + -4/5)
(-3/2)(1/3) + (-3/2)(-4/5)
-1/2 + 6/5
7/10
I think this PDF should assist you in the property of operations for fractions and also help you in solving future problems.