The answer is 499.20 becasue you have to multply 2.4. to 2.08 and that's how you get the answer
-8x^2 + 36xy - 36y^2
btw ^2 means squared
So 18 is most likely gonna be D 19.5 then question 19 looks a bit bigger so I would go with A 22.5 or it’s gonna be C 19.5 so flip a coin on that one and now for question 20 it’s gonna be 11.3
Answer:
n=11
Step-by-step explanation:
(n+4)/10 = (n-8)/2
We can solve using cross products
(n+4) * 2 = 10 * ( n-8)
Distribute
2n+8 = 10n -80
Subtract 2n from each side
2n+8-2n = 10n-80-2n
8 = 8n-80
Add 80 to each side
8+80= 8n-80+80
88 = 8n
Divide each side by 8
88/8 = 8n/8
11 = n