Answer:
72L
Step-by-step explanation:
I'm assuming Tank A and Tank B have the same volume. The question has many typos and is a bit hard to understand
Tank A Volume
V = l × w × h
= 80 × 30 × 50
= 120,000cm²
Tank A Capacity = 120,000ml
=120L
The Question states that Tank A is filled to capacity which means Tank A currently holds 120L of water
Tank A:Tank B = 5:2 = 120:x
120 ÷ 5 = 24L
24 × 7 = 168
168 × 
= 48
This means Tank B currently holds 48L of water
120 - 48 = 72L
∴72 more litres of water is needed to fill Tank B
Answer: the hourly cost of renting a power washer is $5
the hourly cost of renting a generator is $10
Step-by-step explanation:
Let x represent the hourly cost of renting a power washer.
Let y represent the hourly cost of renting a generator.
On his first job, he used each piece of equipment for 6 hours which cost $90. This means that
6x + 6y = 90 - - - - - - - - 1
On his second job, he used the power washer for 4 hours and the generator for 8 which cost $100. This means that
4x + 8y = 100 - - - - - - - - - - 2
Multiplying equation 1 by 4 and equation 2 by 6, it becomes
24x + 24y = 360
24x + 48y = 600
Subtracting, it becomes
- 24y = - 240
y = - 240/-24 = 10
Substituting y = 10 into equation 1, it becomes
6x + 6 × 10 = 90
6x + 60 = 90
6x = 90 - 60 = 30
x = 30/6 = 5
Answer:
b. fundamental arithmetic
Step-by-step explanation:
While fundamental arithmetic is required when solving linear equations, the use of it is not a named <em>method of solution</em>.
"Substitution", "Elimination", and "Graphing" are named methods of solving linear equations. Sometimes the line can be blurred between substitution and elimination, but these methods generally involve distinct sets of steps (which include the use of fundamental arithmetic).
Answer:
x=-6
Step-by-step explanation:
