Help! 7th grade math *four digit problems* its due tommorow

its like this you use the numbers 1-4 you cant repeat them in a answer you can use addition multiplication subtraction not division and you can use () and you have to use all the numbers and or lets say powers like example 3^3 (three to the third power 3X3X3 ) i have done most of them here is number one example: 1= (3X1)-(4-2) they gave me the answers i just need the way you can solve it i need these
12
14
15
18
19
23
29
35
39
43
49
if you can help me out with one or all i would be happy(:

12 = (4+3-1)x2
14 = (4+3)x1x2
15 = (4+2-1)x3
18 = (4+2)x1x3
19 = (3+2)x4-1
23 = 2x3x4-1
35 = 3^2x4-1
48 = 4^2x3x1

Is 18 - 4*(3+1)+2? And 14- (4+3)*2*1? Sorry I couldn't do more...