S(t)=-t³+6t²+5t+7
a(t)=6 м/с²
t-?
v(t)=S`(t)=-3t²+6*2t+5=-3t²+12t+5
a(t)=v`(t)=-3*2t+12=-6t+12
a(t)=6
-6t+12=6
-6t=6-12
-6t=-6
<u>t=1 (с)</u>
У = 2х + m, подставляем.
<span>5 = 2*(-1) + m, </span>
<span>5 = -2 + m, </span>
<span>m = 7. </span>
<span>y = 5, x = -1 - первая точка </span>
<span>y = 11, x = 2 - вторая точка
</span>
A21=30+16sqrt(3)=a1+20d
2+20d=30+16sqrt(3)
20d=28+16sqrt(3)
d=1.4+0.8sqrt(3)≈2.78
5(с+4b)/(c-4b)(c+4b)=5/(c-4b)
5/(14-1)=5/13