Respuesta :

ZeeSq

Answer:

4) 7a+20

5) 14+2b

6) 25c² - 15

Step-by-step explanation:

4) 9a+7-2a+13= 9a-2a+7+13 = 7a+20

5) 21-3b+5b-7= 21-7+5b-3b = 14+2b

6) (3c)² + (8c)² - 15 = 9c² + 16c² - 15 = 25c² - 15

musaddiqkhan
4. Given equation,9a+7-2a+13
=7a+20

5. Given equation,21-3b+5b-7
=2b+14

6. Given equation,3c square +8c square-15
=11c^2-15