Answer:
9
Step-by-step explanation:
Substitute each value in for w:
2w+2(2w+3)=60
2(6)+2(2(6)+3)=60
12+2(12+3)=60
12+2(15)=60
12+30=60
42≠60
2(7)+2(2(7)+3)=60
14+2(14+3)=60
14+2(17)=60
14+34=60
48≠60
2(8)+2(2(8)+3)=60
16+2(16+3)=60
16+2(19)=60
16+38=60
54≠60
2(9)+2(2(9)+3)=60
18 + 2(18+3)=60
18+2(21)=60
18+42=60
60=60
