Answer:
22/7
Step-by-step explanation:
d=2
i.e r=d/2=1
then area of circle=πr^2
=22/7 *1
=22/7 i.e 3.1415
<span> (-2.9a + 6.8 ) + (4.4a - 7.37)
=</span> -2.9a + 6.8 + 4.4a - 7.37
= - 2.9a + 4.4a + 6.8 - 7.37
= 1.5a -0.57
Answer: 1.5a - 0.57
Answer:
B) (7x + 6y)(7x − 6y)
Step-by-step explanation:
C= pi x 2r
C=pi x diameter
D=2r
Answer: the speed of the first train is 50 mph.
The speed of the second train is 100 mph.
Step-by-step explanation:
Let x represent the speed of the first train. The second train travels 50mph faster than the first. It means that the speed of the second train is (x + 50) mph.
Distance = speed × time
If the second train overtakes the first at 7:00 PM, it means that both trains covered the same distance by 7:00 PM. The first train left Miami at 3:00PM. Time spent by the first train is 7 - 3 = 4 hours
Distance covered by the first train in 4 hours is 4x
The second train left at 5:00 PM. Time spent by the second train is 7 - 5 = 2 hours
Distance covered by the second train in 2 hours is 2(x + 50)
Therefore,
4x = 2(x + 50)
4x = 2x + 100
4x - 2x = 100
2x = 100
x = 100/2
x = 50 mph
The speed of the second train is
x + 50 = 50 + 50 = 100 mph