Answer: 1.375
Step-by-step explanation:
Im not good at it, but this may be right?
Answer: 2.5 hours
explanation:
7.5/3=2.5
Answer:
7.5 L of 10% solution and 22.5 L of 30% solution
Step-by-step explanation:
Volume of 10% solution plus volume of 30% solution = total volume of 25% volume.
x + y = 30
Acid in 10% solution plus acid in 30% solution = total acid in 25% solution.
0.10 x + 0.30 y = 30 × 0.25
0.10 x + 0.30 y = 7.5
Solve the system of equations, using either substitution or elimination. I'll use substitution:
x = 30 − y
0.10 (30 − y) + 0.30 y = 7.5
3 − 0.10 y + 0.30 y = 7.5
0.20 y = 4.5
y = 22.5
x = 30 − y
x = 7.5
Sarah needs 7.5 L of 10% solution and 22.5 L of 30% solution.
42. they’re across from each other
Therefore, find f(2) and g(2) first before subtracting.
Therefore,
Then find g(2)
Then put f(2) to subtract g(2)
Therefore, the answer is (f-g)(2) = -49.
