Answer:
I dont know if this is correct, but I think the answer is C
Step-by-step explanation:
Let x = number of 5 cent coins.
Then there are (x+2) 10 cent coins.
Let y = 20 cent coins.
Total coins: x+(x+2)+y = 30
2x+y=28
y = 28-2x (1)
Total value: 0.05x + 0.1(x+2) + 0.2y = 3.80
0.15x + 0.2y + 0.2 = 3.80
0.15x + 0.2y = 3.60 (2)
Substitute (1) into (2).
0.15x + 0.2(28-2x) = 3.60
-0.25x + 5.60 = 3.60
2.00 = 0.25x
8 = x
From (1), obtain y = 28 - 2(8) = 12
Answer: (x+2) = 8+2 = 10
Louise has 10 10-cent coins
Answer:
Not true!
Step-by-step explanation:
Let Denny's initial salary be x.
After the cut, his salary would be 0.97x.
When increasing his salary by 3%,
1.03 x 0.97x = 0.9991 x which is not the same as x.
Hence the statement is not true.
Answer:
You answer is incorrect. The correct answer is -3, -2, -0.8, -1/10, 1/2, 0.8, 7.
Step-by-step explanation:
-3 is the smallest and 7 is the greatest.
1/2 is 0.5, which is smaller than 0.8.
-1/10 is -0.1, which is greater than -0.8.
-2 is greater than -3.
