Remember "SOH CAH TOA"
Sine = (Opposite/Hypotenuse)
Cosine = (Adjacent/Hypotenuse)
Tangent = (Opposite/Adjacent)
In this case, we will be using cosine, and our equation will be 
So firstly, cross-multiply. 
Next, divide both sides by cos(28), and your answer will be 
30/100 +5/10 = 3/10 +5/10 = 8/10 = 4/5
Mrs. Morales will have 4/5 of a liter of juice.
_____
The total quantity was found by adding the quantities of individual kinds of juice. The addition was performed by expressing each fraction using the common denominator of 10, then reducing the final result.
Answer:
? = 3x
Step-by-step explanation:
2(? + 5) = 6x + 10
You must plug in a number that will get the same value on both sides of the equal sign.
2*5 = 10
2*? = 6x
6x/2 = 3x