Steb by step:
3x + x +20 + 32 =180°
4x +52 = 180°
-52 from both sides
4x = 128
divide both sides by 4
x = 32°
Combined speed of the cars = x + x + 14 ( where x is rate of slowest car)
speed =distance / time so
2x + 14 = 950 / 5 = 190
2x + 14 = 190
2x = 176
x = 88 kph answer
EXAMPLE
Find the distance between the points A(−4, −3) and B(5, 7).
SOLUTION
In this case, x1 = −4, x2 = 5, y1 = −3 and y2 = 7.
AB2 = (x2 − x1)2 + (y2 − y1)2
= (5 − (−4))2 + (7 − (−3))2
= 92 + 102
= 181
Thus, AB =
Note that we could have chosen x1 = 5, x2 = −4, y1 = 7 and y2 = −3 and still obtained the same result. As long as (x1, y1) refers to one point and (x2, y2) the other point, it does not matter which one is which.
The answer is B.
(0 less than or equal to y less than or equal to 9)