Answer:
1) 24
2) 42
3) 26
4)44
Step-by-step explanation:
1) 2(8+4) = 2*12 = 24
2) 2(15+6) = 2*21 = 42
3) 2(4+9) = 2*13 = 26
4) 2(12+10) = 2*22 = 44