Answer:
I think this question is incomplete or maybe incorrect but if it's OK then the answer would be 7x + 5y.
Step-by-step explanation:
the answer remains the same because the question has no like terms so no further calculations can be made.
so, it went down from 1250 to 1000, namely 1250 - 1000 = 250.
now, if we take 1250 to be the 100%, what is 250 off of it in percentage?

Answer:
doubles every 10 years
20 years, so it has doubled 2 times
1700 times 4=6800
it is worth $6800
Answer
B. a=1, b=-14, c=49
Divide by 2
Y = 2x - 2.5
x intercept: when y = 0
0 = 2x - 2.5
2.5 = 2x, x = 1.25
y intercept: when x = 0
Y = 2(0) - 2.5, y = -2.5
Solution: (1.25, 0) and (0, -2.5)