Answer: 
Step-by-step explanation:
Given
A gym owner has purple and white weights that measure 10 kg and 6 kg each
respectively.
They weigh 84 kg in total
suppose there x purple and y white weights


Thus, there are 3 purple and 9 white weights.
In euros Derek has twenty two dollars and eighty cents
Question 1
well the is a 1:4 Faculty:trainee ratio
if there are 2:20, that would be a 1:10
you just need to find 1/4th of 20 and thats the total
20/4=5
You need five faculty total so
YOU NEED 3 MORE
Question 2
600 pretzels/10 minutes
?pretzels/52 minutes
600x52/10=3120
Question 3
700 people/ 2 tons
20,850,000/ ? tons
20,850,000 x 2 / 700= <span>59,571.4285714 OR about 60,000 tons</span>
(4x + 3y)(4x − 3y) = (4x)^2 -12xy + 12xy - (3y)^2 =
16x^2 - 9y^2