The right answer is Option D.
Step-by-step explanation:
Given equations are;
2x+4y=3 Eqn 1
x+3y=13 Eqn 2
When we use subtraction-addition method, we make one of the variables same with opposite signs so that only one variable remains after addition or subtraction.
In the given problem, we will multiply Eqn 2 with "-2" so that the x variables become equal and then we can add both the equations and solve for y.
Therefore,
The first step will be to multiply the second equation by -2 to solve the linear system of equations.
The right answer is Option D.
Keywords: linear equations, subtraction
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Answer:
b,c,e
Step-by-step explanation:
B.
He has used the highest recommended percentages to calculate the amounts for the three categories.
Correct Questions:
The correct question has a diagram attached to it which has dimensions of the bedroom floor available which are 15 by 18 feet.
Answer:
Answer is 540 $
Step-by-step explanation:
We will first find the area of the room
Area = Length x Width
Area = 15 x 18 = 270 sq feet
She needs 270 square feet of carpet.
one square feet costs 2 $
so, total cost of carpet = 270 x 2 = 540 $
Answer:
Step-by-step explanation:
We are given that:
The failure rate = 0.1 failure/year
i.e. = 
The repair rate = 365 repair/year, if we convert this to repair/hour; we get:
Time (t) = 1 hour
P(failure) = 1 - R ; if (t=1)
where:
P (failure) = 1 - R
= 1 - 0.9999
= 0.0001
≅ 0
The frequency meantime of failure = 
= 100000
The average downtime of repair for the system = 
= 25
