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Scrat [10]
4 years ago
9

the function d(t)=15t^2-100t gives the distance a car going a certain speed will skid in t seconds. find the time it would take

for the car to skid 170 feet
Mathematics
2 answers:
Blizzard [7]4 years ago
7 0
15t^2 - 100t = 170
15t^2 - 100t - 170 = 0

3t^2 - 20t - 34 = 0

solve for t

t  =  [-(-20) +/- sqrt( 400 - 4*3 *(-34) ] / 6

= 8.07 seconds


Oksana_A [137]4 years ago
7 0
Equate 170 feet to d(t) = 15t^2 - 100t.  Rearrange these 3 terms in descending order according to the powers of t.  Then solve for t.  Use the quadratic formula or some other suitable approach.
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