Quadratic Equasions Question: Alfonso drives a red Nissan Micra. The total stopping distance (tsd) for the car, measured in metres, is given by the formula:

tsd = reaction time (rt) + braking distance (bd)

Alfonso's reaction time is given by the formula rt = ¼ v and the car's braking distance is given bd = ⅛ v² where v is his speed measured in metres per second. whilst driving around town, Alfonso is forced to perform an emergency stop; his total stopping distance is 15 metres. calculate the speed Alfonso was travelling, give your answer in km/h.

1. 180°. the sum of the interior angles of a triangle is 180°, for the equilateral triangle that it has three equals side is 60°+60°+60°=180°.

2. 60°. each interior angle of a equilateral triangle is 60°

3. 120°. the measure of ∠m is 120°, the sum of the angles ∠m and ∠n is equal to 180°. so, in order to find the measure of ∠m, we have ∠m+∠n=180° > ∠m=180°-∠n > ∠m=180°-60°=120°.

4. 360°. the sum of the exterior angles of an equilateral triangle is ∠m+∠r+∠x=120°+120°+120°=360°. the exterior angles of any triangle always add 360°.

t= half of the arc subtended by t.

r= half of the arc subtended by r.  

t+r= half of the arc subtended by t + half of the arc subtended by r= half of 360=180

step-by-step explanation:

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