find the discriminant of each quadratic equation then state the number and type of solutions.-7b^2+b-18=-9

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Ответ:

sdawg420

01.02.2023

Mathematics

20 seconds

Step-by-step explanation:

Given:

Position of car = s(t) = 60t-1.5t^2

The speed is the change in position.

So,

$Speed\ of\ car=\frac{ds}{dt} = \frac{d}{dt} (60t) -\frac{d}{dt} (1.5t^2)\\=60-2t(1.5)\\=60-3t$

When the car will stop, the speed will be zero.

$60-3t=0\\3t=60\\t = \frac{60}{3}\\ t=20$

Therefore, the car will stop after 20 seconds of applying the break ..

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