9514 1404 393
Answer:
450 L
Step-by-step explanation:
Let x represent the number of liters of 70% solution needed. Then the amount of 15% solution needed is (550-x), and the total amount of acid in the mixture is ...
0.70x + 0.15(550-x) = 0.60(550)
0.55x + 82.5 = 330 . . . . simplify
0.55x = 247.5 . . . . . . . . . subtract 82.5
x = 450 . . . . . . . . . . . divide by 0.55
450 liters of 70% acid solution must be used.
First, subtract 7 from both sides.
5a = b - 7
Now divide both sides by 5.
a = b - 7 / 5
Find common ratio
1 times -3=-3
-3 times -3=9
an=a1(r^(n-1))
a1=first term
r=common ratio
n=which term
an=1(-3)^(n-1)
9th term
n=9
an=1(-3)^(9-1)
an=1(-3)^(8)
an=1(6561)
an=6561
answer is D
Answer: no hay opuesto de cero, cero es el último número de positivos y negativos
Answer:
12 inches of wire
Step-by-step explanation:
Given:
- 14 in = $0.60
- x in = $0.48
Solve:
Set up a proportion to solve this equation. We can find the price for 1 inch first.
- Solve for 1 inch
- 15 in = $0.60
- 1 in = $0.60 / 15
- 1 in = $0.04
Now, we know that 1 inch of wire costs $0.04. We can solve for the x inxhes:
- Solve for x inches
- x in ·$0.04 = $0.48
- x in = $0.48 ÷ $0.04
- x in = 12
- x = 12
You can buy 12 inches of wire.
-Chetan K