Can someone please help me with the following:

Convert:

a.) 213 base 5 to base 10

b.) 15 base 10 to base 5

c.) 132 base 4 to base 10

d.) 8 base 10 to base 4

My answers:

a.) 58

b.) 30

c.) 31

d.) 20

And then I have to do the following:

1.) (22+44)_5 = ?

2.) (32-14)_5

I said:

1.) 71

2.) 12

Can someone please confirm?