Let's look at it like this:
5/10+1/5 = (5/10) + (1/5)
5/10 = 0,5
1/5 = 0,2
so it's 5/10 + 1/5 = (5/10) + (1/5) = 0,5 + 0,2 = <u>0,7 </u>
to convert fractions to percentages, we use this formula: x/y = z/100
where x is the fraction numerator, y is the fraction denominator, and z is the percentage
so plug the numbers in: x/12 = 88.2/100
cross multiply: 100x = 1058.4
divide each side by 100: x = 10.584
88.2% = 10.584/12
ANSWER:
#1 = A
W≤-1
#2= I
X>-2
#3= K
X≤-6
#4= D
K≥7