3. a)8.3x+2x-60.5=300
10.3x-60.5=300
10.3x=300+60.5
10.3x=360.5
x=360.5/10.3
x=35
b) (1.65-0.3x)/0.34=4.5
1.65/0.34-0.3x/0.34=4.5
4.85-0.88x=4.5
-0.88x=4.5-4.85
-0.88x=-0.35
x=-0.35/(-0.88)
x=0.4
4. s=531.76
t=3.4h
v1=1.3*v2
s=v/t
s=s1+s2; s1=v1/t; s2=v2/t
s=v1/t+v2/t |*t
st=v1+v2; v1=1.3v2
st=1.3v2+v2=2.3v2
v2=st/2.3=(531.76*3.4)/2.3=1807.984/2.3
v2=786.08 km/h
v1=1.3*786.08
v1=1021.904km/h