Answer:
4) j<3
5) solution:
[tex]-23\leq k<1\\interval=[-23,1)[/tex]
Step-by-step explanation:
4)[tex]15j+12<57\\15j+12-12<57-12\\15j<45\\\frac{15j}{15}<\frac{45}{15}\\j<3[/tex]
5)[tex]3>\frac{11+k}{4}\quad \mathrm{and}\quad \frac{11+k}{4}\ge \:-3\\3>\frac{11+k}{4}\quad : k<1\\\frac{11+k}{4}\quad\geq -3: k\geq -23\\k<1\quad \mathrm{and}\quad \:k\ge \:-23\\-23\le \:k<1[/tex]
