There are 15 grams of coco in the chocolate bar.
(30% of 50 is 15)
Answer:

Step-by-step explanation:
Answer:
The answer is:

which agrees with the last answer option (D) in the list.
Step-by-step explanation:
In order to add rational expressions, we need to express them with the same denominator. Therefore we examine what factors there are in the first denominator, which happens to be a difference of squares which is readily factored out as:

the second denominator consists of only one of these factors:
, then in order to express both rational expressions with the same common denominator, we multiply numerator and denominator of the second fraction by the factor: 
Then we get two expressions that can be easily added as shown below:

What’s your question about you doing ok with
1046₈ = 1*8³ + 0*8² + 4*8¹ + 6*8⁰
1046₈ = 512 + 0 + 32 + 6
1046₈ = 550₁₀