Simplify:
(1) 2+(−4)−(+3)
(2) −5+4−(−2)
(3) 10+(−5)−(−4)
(4) 12−(+6)+(−3)
(5) −15+(−4)−(+3)
Find the values of exponential numbers.
(1) 44
(2) 25
(3) 64
(4) (−3)4
(5) (−5)3