Answer:
The scientist needs 80 liters of 25% solution and 40 liters of 10% solution.
Step-by-step explanation:
If x is the liters of 25% solution, and y is the liters of 10% solution, then:
x + y = 120
0.25x + 0.10y = 0.20(120)
Solve the system of equations using substitution or elimination. Using substitution:
0.25x + 0.10(120 − x) = 0.20(120)
0.25x + 12 − 0.10x = 24
0.15x = 12
x = 80
y = 40
The scientist needs 80 liters of 25% solution and 40 liters of 10% solution.
Answer:

Step-by-step explanation:
The triangle on the right is shorter than the triangle on the left, plus you an clearly see that we do not have enough information as proof that we cannot use this theorem.
I am joyous to assist you at any time.
Answer:
69
It wont always be easy, but always try to do what ' s right!
In a world of worriers, be the warrior!
When nothing goes right, go left.
(a) C = 3.60+2.19d
(b) The cab fare will be $36.45 for a distance of d kilometers.
Step-by-step explanation:
Given,
Charges of Flag Fall = $3.60
Per kilometer charges = $2.19
Let,
d be the total distance.
C be the total cost for d kilometers.
(a) Write down an equation to calculate the cost, C, of cab fare for a distance d kilometres.
Total cost = Charges of flag fall + Per kilometer charges * distance
C = 3.60+2.19d
(b) Use your equation to calculate the cost of cab fare for a distance of 15 km.
Here,
d=15
Putting in Equation

The cab fare will be $36.45 for a distance of d kilometers.
Keywords: distance, addition
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The 8 rounds up so the answer is 1630