Answer:
r = 1.3
Step-by-step explanation:
Another Answer is Futile
Let:
x=ml of 30% alcohol solution
y=ml of 80% alcohol solution.
100 ml of 50% alcohol solution has 50 ml of alcohol and 50 ml of water.
50 % of 100 ml=(50/100)100 ml=50 ml
ml of alcohol in a 30% alcohol solution=0.3 (number of ml of 30% alcohol solution). In this case would be: 03x
ml of alcohol in a 80% alcohol solution=0.3 (number of ml of 30% alcohol solution). In this case would be: 0.8y
We can suggest this system of equations:
x+y=100
0.3x+0.8y=50
We can solve this system of equations by substitution method:
x+y=100 ⇒ y=100-x
0.3x+0.8(100-x)=50
0.3x+80-0.5x=50
0.3x-0.5x=50-80
-0.2x=-30
x=-30/(-0.2)
x=60
y=100-x
y=100-60
y=40
Answer: She should mix 60 ml of a 30% alcohol soluiton with 40 ml of 80% alcohol solution.
Answer:
B
Step-by-step explanation:
hope you get the best grade
Answer:
794.42 in² (since I used the pi = 3.14159
, the result is slightly different,
Step-by-step explanation:
Formula: Given radius and slant height calculate the height, volume, lateral surface area and total surface area.
Given r, s find h, V, L, A
h = √(s² - r²)
r = 11 in
h = 4.796 in
s = 12 in
V = 607.7 in³
L = 414.7 in²
B = 380.1 in²
A = 794.8 in
Agenda: r = radius
h = height
s = slant height
V = volume
L = lateral surface area
B = base surface area
A = total surface area
π = pi = 3.14159
√ = square root