The relationships of the 4's is 40,000 and 4,000
Answer:
D
Step-by-step explanation:
Answer:
key details, because it tells you more about the story
1. 1st number be x, 2nd number be y
Adding 5 times the first number and 8 times the second number gives a total of -13
so 5x+8y=-13
Adding 5 times the first number and 10 times the second number gives -15
so 5x+10y=-15
subtracting the above two eqns
(5x+8y)-(5x+10y) = -13-(-15)
-2y=2
y=-1
put back in first eqn 5x+8(-1)=-13
5x=-5
x=-1
2. area of town A = 1500
every year, the area of the town decreases by 7%
so after 1 year, A=1500*(1-7%)=1500*(0.93)
after x years, A=1500(0.93)^x