Respuesta :

3a is 7
4a is 1.428571429
4b is 19
5a is 35
5b is 14
 Hope it helps!
3a. 7-5+5 = 7
4a. 5*2/7= 10/7
4b. 5+8*7/4= 61/4
5a. 5*7= 35
5b. 6+8= 14