Number 4 and 6 are correct because you can only add variables with other variables so that is why 4 and 6 are correct
The time taken for radio signal to the earth's surface we shall proceed as follows;
time=(distance)/(speed)
Distance=7.5×10^6 meters
speed=3×10^8 meters/second
therefore:
Time=(7.5×10^6)/(3×10^8)=0.025 seconds
We conclude that it will take the signal 0.025 seconds to reach the surface of the earth.
Answer:
B
Step-by-step explanation:
Answer:
Eliminating method
Step-by-step explanation:
For the given situation i.e.
3x + y = 1
And,
4x + y = 2
Here we use the elimination to determine the value of x and y
So,
3x + y = 1
4x + y = 2
- - -
-x = -1
x = 1
Now put the value of x in any of the above equation
So,
3 + y = 1
y = -2
We know that the sum of all angles in a triangle = 180°
Angle (A+B+C) = 180°
or
(3x°+13) + (x°-8) + x° = 180
5x° + 5 = 180°===> 5x° = 175° & x =35°
