The expression for number of hours is: C. (3.39 × 10^7) ÷ (3.6 × 10^4)
The equations with no solutions are : A,B and C.
Step-by-step explanation:
The formula for time is distance divided by speed.
The distance given is 3.39 × 10⁷ miles.
The speed given is 3.6 × 10⁴ miles/hour
The time in hours will be = (3.39 × 10⁷ ÷3.6 × 10⁴) =941.67 hours
B.
Test to see if the equations have solutions;
(3x+4y=5)--------multiply by 6
(6x+8y=10 )-------multiply by 3
18x+24y=30
18x+24y=30 --------performing subtraction will give a zero on both sides. No solution.
The same to option B,and C.
For option D;
3x+6y=1
x+y=0 -------this can be written as x= -y
Sustitute x=-y in the first equation
3(-y) +6y =1
-3y+6y=1
3y=1
y=1/3
But x+y=0
Hence;
x+1/3=0
x=-1/3
solution ( -1/3, 1/3)
Lean More
Formula for speed:https://brainly.com/question/8311838
Solving inequalities:https://brainly.com/question/11213549
Keywords: distance, average speed, time, equations, solutions
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